function changeClass(sourceId,targetClass) {
	if (document.getElementById(sourceId) && targetClass != '')  {
		obj = document.getElementById(sourceId);
		obj.className = targetClass;

	}
}


function changeVisibility(id1,id2){
                if (document.getElementById(id1).checked){
                   document.getElementById(id2).style.display="block";
                } else {
                    document.getElementById(id2).style.display = "none";

                }
		            }