function toggle(div_id) {
    var el = document.getElementById(div_id);
    if (el.style.display == 'none') { el.style.display = 'block'; }
    else { el.style.display = 'none'; }
}
function window_pos(popUpDivVar) {
    if (typeof window.innerWidth != 'undefined') {
        viewportwidth = window.innerHeight;
    } else {
        viewportwidth = document.documentElement.clientHeight;
    }
    if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
        window_width = viewportwidth;
    } else {
        if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
            window_width = document.body.parentNode.clientWidth;
        } else {
            window_width = document.body.parentNode.scrollWidth;
        }
    }
    var popUpDiv = document.getElementById(popUpDivVar);
    window_width = window_width / 2 - 150; //150 is half popup's width
    popUpDiv.style.left = window_width + 'px';
}
function showdiv(Xwidth, Yheight, divid) {
    // First, determine how much the visitor has scrolled 

    var scrolledX, scrolledY;
    if (self.pageYOffset) {
        scrolledX = self.pageXOffset;
        scrolledY = self.pageYOffset;
    } else if (document.documentElement && document.documentElement.scrollTop) {
        scrolledX = document.documentElement.scrollLeft;
        scrolledY = document.documentElement.scrollTop;
    } else if (document.body) {
        scrolledX = document.body.scrollLeft;
        scrolledY = document.body.scrollTop;
    }

    // Next, determine the coordinates of the center of browser's window 

    var centerX, centerY;
    if (self.innerHeight) {
        centerX = self.innerWidth;
        centerY = self.innerHeight;
    } else if (document.documentElement && document.documentElement.clientHeight) {
        centerX = document.documentElement.clientWidth;
        centerY = document.documentElement.clientHeight;
    } else if (document.body) {
        centerX = document.body.clientWidth;
        centerY = document.body.clientHeight;
    }

    // Xwidth is the width of the div, Yheight is the height of the 
    // div passed as arguments to the function: 
    var leftOffset = scrolledX + (centerX - Xwidth) / 2;
    var topOffset = scrolledY + (centerY - Yheight) / 2;
    // The initial width and height of the div can be set in the 
    // style sheet with display:none; divid is passed as an argument to // the function 
    var o = document.getElementById(divid);
    var r = o.style;
    r.position = 'absolute';
    r.top = topOffset + 'px';
    r.left = leftOffset + 'px';
    r.display = "block";
}
function onSilverlightError(sender, args) {
    var appSource = "";
    if (sender != null && sender != 0) {
        appSource = sender.getHost().Source;
    }

    var errorType = args.ErrorType;
    var iErrorCode = args.ErrorCode;

    if (errorType == "ImageError" || errorType == "MediaError") {
        return;
    }

    var errMsg = "Unhandled Error in Silverlight Application " + appSource + "\n";

    errMsg += "Code: " + iErrorCode + "    \n";
    errMsg += "Category: " + errorType + "       \n";
    errMsg += "Message: " + args.ErrorMessage + "     \n";

    if (errorType == "ParserError") {
        errMsg += "File: " + args.xamlFile + "     \n";
        errMsg += "Line: " + args.lineNumber + "     \n";
        errMsg += "Position: " + args.charPosition + "     \n";
    }
    else if (errorType == "RuntimeError") {
        if (args.lineNumber != 0) {
            errMsg += "Line: " + args.lineNumber + "     \n";
            errMsg += "Position: " + args.charPosition + "     \n";
        }
        errMsg += "MethodName: " + args.methodName + "     \n";
    }

    throw new Error(errMsg);
}