function validate(evt) {
var theEvent = evt || window.event;
var key = theEvent.keyCode || theEvent.which;
key = String.fromCharCode( key );
var regex = /^[0-9.,]+$/;
if( !regex.test(key) && !regex.test('.,') && !regex.test(',.')) {
theEvent.returnValue = false;
if(theEvent.preventDefault) theEvent.preventDefault();
}
}