function insert(el,ins) {
    if (el.setSelectionRange){
		el.focus(el);
        el.value = el.value.substring(0,el.selectionStart) + ins + el.value.substring(el.selectionStart,el.selectionEnd) + el.value.substring(el.selectionEnd,el.value.length);
	}
    else if (document.selection && document.selection.createRange) {
        el.focus(el);
        var range = document.selection.createRange();
        range.text = ins + range.text;
    }
}

function onSilverlightError(sender, args) {

var appSource = "";
if (sender != null && sender != 0) {
appSource = sender.getHost().Source;
}
var errorType = args.ErrorType;
var iErrorCode = args.ErrorCode;

var errMsg = "Unhandled Error in Silverlight 2 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);
}