function roll(img_name, img_src)
{
   document[img_name].src = img_src;
}
function DoNav(theUrl,theTarget)
{
	if (theTarget == '_blank') {
		window.open(theUrl);	
	}
	else {
		document.location.href = theUrl;
	}
}
function RefreshImage(valImageId) {
	var objImage = document.images[valImageId];
	if (objImage == undefined) {
		return;
	}
	var now = new Date();
	objImage.src = objImage.src.split('?')[0] + '?x=' + now.toUTCString();
}
function LTrim(str)
{
        var whitespace = new String(" \t\n\r ");
        var s = new String(str);
        if (whitespace.indexOf(s.charAt(0)) != -1) {
            var j=0, i = s.length;
            while (j < i && whitespace.indexOf(s.charAt(j)) != -1)
                j++;
            s = s.substring(j, i);
        }
        return s;
}
function RTrim(str)
{
        var whitespace = new String(" \t\n\r ");
        var s = new String(str);
        if (whitespace.indexOf(s.charAt(s.length-1)) != -1) {
            var i = s.length - 1;
            while (i >= 0 && whitespace.indexOf(s.charAt(i)) != -1)
                i--;
            s = s.substring(0, i+1);
        }
        return s;
}
function Trim(str)
{
        return RTrim(LTrim(str));
}