function showDetails(elem){
	var _id = elem[elem.selectedIndex].value;
	for(var i=1;i<17;i++){
		if(_id == i){
			document.getElementById('reg_'+i).className = 'vis';
			//alert(document.getElementById('reg_'+i).className);
		}else{
			document.getElementById('reg_'+i).className = 'unvis';
		}
	}
}