// JavaScript Document

function onlyNumbersAllowed(evt, whichForm, whichField) {
evt = (evt) ? evt : event;
    var charCode = (evt.charCode) ? evt.charCode : ((evt.keyCode) ? evt.keyCode : 
        ((evt.which) ? evt.which : 0));
    if (charCode > 31 && (charCode < 48 || charCode > 57)) 
	{
        alert("Enter numerals only in this field.");
        document.forms[whichForm].elements[whichField].focus();
		document.forms[whichForm].elements[whichField].select()		
		return false;
    }
}