function focus() {
	document.frm.regno.focus();
	}	

function compulsory() {
	a1=document.frm.regno.value;
	b1=a1.length;                                 
	if(b1==0)
	{
		alert("Please enter  your registration no");
		document.frm.regno.focus();
		return false;
	}
}

function cancel() {
	document.frm.regno.value='';
	document.frm.regno.focus();
	return false;
}
function disable() {
	document.frm.regno.value = '';
	document.frm.regno.disabled = true;
}