function hover(object, p, ext)
{
	var reg= /(.+)\.(.+)/;
	var src=object.firstChild.src;
	var arr=reg.exec(src);
	var quelle=RegExp.$1;
	var endung="."+RegExp.$2;

	switch(p)
	{
		case "over":							//onMouseover
		var hover=quelle+ext+endung;	
		break;							  	
		case "out":							//onMouseout
		var hover=quelle.substr(0, quelle.length-ext.length)+endung;    
	}
//	alert(hover);
	object.firstChild.src=hover;
}


function trHover(object, color)
{
		object.style.backgrundColor = color;
		anz = object.getElementsByTagName("td").length;
		
		for(var i=0; i<anz; i++)
		{
			object.getElementsByTagName("td")[i].style.backgroundColor = color;
		}
}