function ChangeClass(theobj,theclass)
{
    //alert(theobj);
	document.getElementById(theobj).className = theclass;
}
	
	
function ChangeImg(theobj,action)
{	
	if(action == 'on')
	{
		imgsrc = "Images/buttons/" + theobj + "_on.jpg";
	}
	else
	{
		imgsrc = "Images/buttons/" + theobj + ".jpg";
	}
		
	document.getElementById(theobj).src = imgsrc;
}