function showhide(classname){
	var coll = document.getElementsByTagName("Div");
	for(var i=0; i<coll.length; i++){
		if(coll[i].className == classname){
			if(coll[i].style.display == 'none'){
				coll[i].style.display='block';
			}
			else{
				coll[i].style.display='none';
			}
		}
	}
}