/*
written by Pachollini (Matej Novak) http://seky.nahory.net/
original najdete na http://seky.nahory.net/2005/04/kulate-rohy-nifty-corners/
see http://seky.nahory.net/2005/04/rounded-corners/ for description
inspired by Alessandro Fulciniti's http://pro.html.it/esempio/nifty/

version 1.2: Safari bug fixed
version 1.1: limited support for rounded borders added

this script is free to use, modify, sell and whatever you might want to do with it
keeping notice about the author or linking my website is highly appreciated
enjoy :-)

*/

function make_corners_01()
	{
	var $i;
	var $elements=find_class(document.body,"div3");
	if(!(navigator.appName=="Microsoft Internet Explorer" && navigator.appVersion.indexOf("5.5")>-1)) for($i in $elements) rounded_corners($elements[$i]);
	}

function make_corners_02()
	{
	var $i;
	var $elements=find_class(document.body,"div4");
	if(!(navigator.appName=="Microsoft Internet Explorer" && navigator.appVersion.indexOf("5.5")>-1)) for($i in $elements) rounded_corners($elements[$i]);
	}

function make_corners_03()
	{
	var $i;
	var $elements=find_class(document.body,"div6");
	if(!(navigator.appName=="Microsoft Internet Explorer" && navigator.appVersion.indexOf("5.5")>-1)) for($i in $elements) rounded_corners($elements[$i]);
	}

function make_corners_04()
	{
	var $i;
	var $elements=find_class(document.body,"div7");
	if(!(navigator.appName=="Microsoft Internet Explorer" && navigator.appVersion.indexOf("5.5")>-1)) for($i in $elements) rounded_corners($elements[$i]);
	}

function make_corners_05()
	{
	var $i;
	var $elements=find_class(document.body,"nifty");
	if(!(navigator.appName=="Microsoft Internet Explorer" && navigator.appVersion.indexOf("5.5")>-1)) for($i in $elements) rounded_corners($elements[$i]);
	}

function rounded_corners($element)
	{
	var $rc_radius=10, $rc_left=true, $rc_right=true, $rc_top=true, $rc_bottom=true, $rc_self_color, $rc_parent_color, $rc_antialiased,$rc_antialiased_cf=0.33,$rc_compact,$rc_auto_margin,$rc_method="margin",$rc_border,$border_color;
	var	$property,$container,$el_container,$el_inner,$j,$i,$ang,$ang_last,$bw,$width,ee,$err_alert;
	var $classes=$element.className.split(" ");
	$rc_self_color=get_current_style($element,"background-color","(transparent)|(rgba)");
	$rc_parent_color=get_current_style($element.parentNode,"background-color","(transparent)|(rgba)");
	$border_color=get_current_style($element,"border-top-color");
	for ($i in $classes)
		{
		$property=$classes[$i].split("-");
		if($property[0]=="rc") switch ($property[1])
			{
			case "radius":
				$rc_radius=$property[2];
				break;
			case "top":
				$rc_top=$property[2]!="0"?true:false;
				break;
			case "left":
				$rc_left=$property[2]!="0"?true:false;
				break;
			case "right":
				$rc_right=$property[2]!="0"?true:false;
				break;
			case "bottom":
				$rc_bottom=$property[2]!="0"?true:false;
				break;
			case "selfcolor":
				$rc_self_color="#"+$property[2];
				break;
			case "parentcolor":
				$rc_parent_color=$property[2]=="transparent"?"transparent":"#"+$property[2];
				break;
			case "inheritstylecolors":
				$rc_parent_color=$property[2]!="0"?false:true;
				$rc_self_color=$property[2]!="0"?false:true;
				break;
			case "antialiased":
				$rc_antialiased=$property[2]!="0"?true:false;
				break;
			case "antialiasedcf":
				$rc_antialiased_cf=parseFloat($property[2]);
				break;
			case "compact":
				$rc_compact=$property[2]!="0"?true:false;
				break;
			case "automargin":
				$rc_auto_margin=$property[2]!="0"?true:false;
				break;
			case "method":
				$rc_method=$property[2];
				break;
			case "border":
				$rc_method="margin";
				$rc_border=true;
				$element.style.border="none";
				break;
			}
		}
	if($rc_antialiased && $rc_method=="margin")
		{
		var $arr_self_color=color2array($rc_self_color);
		var $arr_parent_color=$rc_border?color2array($border_color):color2array($rc_parent_color);
		if($arr_self_color!=false && $arr_parent_color!=false) var $rc_antialiased_color="rgb("+Math.round(($arr_parent_color[0]-$arr_self_color[0])*$rc_antialiased_cf+$arr_self_color[0])+","+Math.round(($arr_parent_color[1]-$arr_self_color[1])*$rc_antialiased_cf+$arr_self_color[1])+","+Math.round(($arr_parent_color[2]-$arr_self_color[2])*$rc_antialiased_cf+$arr_self_color[2])+")";
		else $rc_antialiased=false;
		}
	var $containers=new Array();
	if($rc_top)$containers[0]="top";
	if($rc_bottom)$containers[$containers.length]="bottom";
	if(!$rc_parent_color)$rc_parent_color=get_current_style(document.body,"background-color");
	for($j in $containers)
		{
		$container=$containers[$j];
		$el_container=document.createElement("div");
		$el_container.className="rc-container-"+$container;
		if($rc_parent_color && $rc_method=="margin")
		    {
		    try
		      {
		      $el_container.style.backgroundColor=$rc_parent_color;
		      }
		     catch(ee){self.status="Chyba nastaveni pozadi."}
		    }
		$el_container.style.height=$rc_radius+"px";
		for($i=0;$i<$rc_radius;$i++)
			{
			$el_inner=document.createElement("span");
			if($rc_self_color && $rc_method=="margin")$el_inner.style.backgroundColor=$rc_self_color;
			$el_inner.style.display="block";
			$el_inner.className="rc-inner rc-level-"+$i;
			$ang=Math.asin($i/$rc_radius);
			$el_inner.style.height="1px";
			$el_inner.style.overflow="hidden";
			$width=($rc_radius-Math.round($rc_radius*Math.cos($ang)));
			if($rc_method=="margin")
				{
				$el_inner.style.margin="0 "+($rc_right?$width:"0")+"px 0 "+($rc_left?$width:"0")+"px";
				if($rc_antialiased || $rc_border)
					{
					$bw=Math.ceil($rc_radius*Math.cos(Math.asin(($i-1)/$rc_radius))-$rc_radius*Math.cos($ang));
					if($bw==0)$bw=1;
					$el_inner.style.borderWidth="0 "+($rc_right?$bw:"0")+"px 0 "+($rc_left?$bw:"0")+"px";
					if(!$rc_border)
						{
						try{$el_inner.style.borderColor=$rc_antialiased_color;}
						catch($ee){if(!$err_alert)alert("There's probably a wrong CSS declaration of color used (use '#000000' instead of 'black' or '#000'.");$err_alert=true;}
						}
					else
						{
						$el_inner.style.borderColor=($rc_antialiased && $width) ? $rc_antialiased_color : $border_color;
						if($i==$rc_radius-1)
							{
							$el_inner.style.backgroundColor=$border_color;
							}
						}
					$el_inner.style.borderStyle="solid";
					}
				}
			else
				{
				if($rc_parent_color)$el_inner.style.borderColor=$rc_parent_color;
				$el_inner.style.borderStyle="solid";
				$el_inner.style.borderWidth="0 "+($rc_right?$width:"0")+"px 0 "+($rc_left?$width:"0")+"px";
				}
			if($container=="top" && $el_container.firstChild)$el_container.insertBefore($el_inner.cloneNode(true),$el_container.firstChild);
			else $el_container.appendChild($el_inner.cloneNode(true));
			delete $el_inner;
			}
		if($rc_compact)
			{
			if($container=="top") $el_container.style.marginBottom="-"+$rc_radius+"px";
			else $el_container.style.marginTop="-"+$rc_radius+"px";
			}
		if($rc_auto_margin)
			{
			$el_container.style.marginLeft="-"+get_current_style($element,"padding-left");
			$el_container.style.marginRight="-"+get_current_style($element,"padding-right");
			if($container=="top") $el_container.style.marginTop="-"+get_current_style($element,"padding-top");
			else $el_container.style.marginBottom="-"+get_current_style($element,"padding-bottom");
			}
		if($container=="top" && $element.firstChild)$element.insertBefore($el_container.cloneNode(true),$element.firstChild);
		else $element.appendChild($el_container.cloneNode(true));
		delete $container;
		}
	}

// common functions:

function find_class($element,$classnames,$result,$first)
  {
  if(!$first)$first=$element;
  if(!$result)$result=new Array();
  if ($element.nodeType==1)
    {
    var $test_exp=new RegExp("(^| )("+$classnames+")( |$)");
    if($test_exp.test($element.className)) $result[$result.length]=$element;
    }
  if ($element.hasChildNodes()) $result=find_class($element.firstChild,$classnames,$result,$first);
  if ($element.nextSibling && $element!=$first) $result=find_class($element.nextSibling,$classnames,$result,$first);
  return $result;
  }

function get_current_style($element,$property,$not_accepted)
  {
  var ee,$i,$val,$apr;
  var $na=new RegExp($not_accepted);
  try
    {
    var $cs=document.defaultView.getComputedStyle($element,'');
    $val=$cs.getPropertyValue($property);
    }
  catch(ee)
    {
    if($element.currentStyle)
    	{
	    $apr=$property.split("-");
	    for($i=1;$i<$apr.length;$i++) $apr[$i]=$apr[$i].toUpperCase();
	    $apr=$apr.join("");
	    $val=$element.currentStyle.getAttribute($apr);
	    }
    }
  
  if($not_accepted && $na.test($val) && $element.parentNode) $val=get_current_style($element.parentNode,$property,$not_accepted);
  return $val;
  }

function color2array($value)
	{
	if($value.substr(0,1)=="#")return hex2array($value);
	else if($value.indexOf("rgb")>-1) return rgb2array($value);
	else return false;
	}

function rgb2array($value)
	{
	var $i;
	var $regexp=/([0-9]+)[, ]+([0-9]+)[, ]+([0-9]+)/;
	var $array=$regexp.exec($value);
	$array.shift();
	for($i=0;$i<3;$i++)$array[$i]=parseInt($array[$i]);
	return($array);
	}

function hex2array($value)
	{
	return new Array(parseInt($value.substr(1,2),16),parseInt($value.substr(3,2),16),parseInt($value.substr(5,2),16));
	}