function isDigit(num) {
	if (num.length>1){return false;}
	var string="1234567890";
	if (string.indexOf(num)!=-1){return true;}
	return false;
	}

function isNumberValid(strNum) {
var nCheck = 0;
var nDigit = 0;
var bEven  = false;

for (n = strNum.length - 1; n >= 0; n--) {
    var cDigit = strNum.charAt (n);
    if (isDigit (cDigit)) {
        var nDigit = parseInt(cDigit, 10);
        if (bEven) {
            if ((nDigit *= 2) > 9) nDigit -= 9;
        }
        nCheck += nDigit;
        bEven = ! bEven;
    }
    else if (cDigit != ' ' && cDigit != '.' && cDigit != '-')
        return false;
    }
    return (nCheck % 10) == 0;
}

function CheckCCNumber(sender, args)
{
    if (isNumberValid(args.Value))
    {
        args.IsValid = true;
        return;
    }
    args.IsValid = false;
}

function dimArea(objId)
{
    obj = document.getElementById(objId);
    obj.style.display = '';
    setOpacity(obj,60);
}

function setOpacity(obj, opacity) 
{
    opacity = (opacity == 100)?99.999:opacity;
    // IE/Win
    obj.style.filter="progid:DXImageTransform.Microsoft.Alpha(opacity=" + opacity + ");";
    // Safari<1.2, Konqueror
    obj.style.KHTMLOpacity = opacity/100;
    // Older Mozilla and Firefox
    obj.style.MozOpacity = opacity/100;
    // Safari 1.2, newer Firefox and Mozilla, CSS3
    obj.style.opacity = opacity/100;
}