function isIE6()
{
    var is_minor;
    var is_major;
	var appVer = navigator.appVersion.toLowerCase();
	var iePos = appVer.indexOf('msie');
	var isIE6 = false;
	if (iePos !=-1)
	{
		is_minor = parseFloat(appVer.substring(iePos+5,appVer.indexOf(';',iePos)));
		is_major = parseInt(is_minor);
	}

	// Check if IE version is 6 or older
	if (navigator.appName.substring(0,9) == "Microsoft")
		isIE6 = (is_major <= 6);
	return 	isIE6;
}

function isIE() {  
    var appVer = navigator.appVersion.toLowerCase();
    var isIE = false;
   
    // Check if IE version is 6 or older
    if (navigator.appName.substring(0, 9) == "Microsoft")
        isIE = true;
    return isIE;
}

function getKeyCode(e)
{
    var keynum;
    if (e != null)
    {
        if(window.event) // IE
            keynum = e.keyCode;
        else if(e.which) // Netscape/Firefox/Opera
            keynum = e.which;
    }
    
    return keynum;
}

String.prototype.trim = function() {
    return this.replace(/^\s+|\s+$/g, "");
}
String.prototype.ltrim = function() {
    return this.replace(/^\s+/, "");
}
String.prototype.rtrim = function() {
    return this.replace(/\s+$/, "");
}