function checknum(strcontrol) {
	    var str = strcontrol.value
	    for (var i = 0; i < str.length; i++) {
	        var ch = str.substring(i, i + 1)
	        if (ch != "." && (ch < "0" || ch > "9")) {
	            alert("Please enter a numeric value.")
	            strcontrol.value = "";
	            strcontrol.focus();
	            return 0;
	        }
	    }
	    return str;
	}

	function convdec(strng) {
		if (strng == 0) {
			return "0.00";
		} else {
			var str = "" + Math.round(strng * 100);
			return(str.substring(0, str.length-2) + "." + str.substring(str.length-2, str.length));
		}
	}