input only numberic

gistfile1.md

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) ) {
		// alert('hello')
	theEvent.returnValue = false;
	if(theEvent.preventDefault) theEvent.preventDefault();
	}
}