var isIE = document.all ? true : false;
var isNS = document.layers ? true : false;

function onlyDigits(e, decReq) {
    var key = (isIE) ? window.event.keyCode : e.which;
    var obj = (isIE) ? event.srcElement : e.target;
    var isNum = (key > 47 && key < 58) ? true : false;
    var dotOK = (key == 46 && decReq == 'decOK' && (obj.value.indexOf(".") < 0 || obj.value.length == 0)) ? true : false;
    if (key < 32)
        return true;
    return (isNum || dotOK);
}

/* onkeypress="return onlyDigits(event,'noDec')"*/