var isIE6 = ( window.external && typeof window.XMLHttpRequest == "undefined");
var isChrome = (navigator.userAgent.toLowerCase().indexOf('chrome') > -1);

function js_setCookie(c_name, value, expirehours) {
	if (expirehours == 0)
	{
		var exdate = new Date();
		exdate.setHours(24);
		exdate.setMinutes(0);
		exdate.setSeconds(0);
		exdate.setMilliseconds(0);
		document.cookie = c_name + "=" + escape(value) + ";expires=" + exdate.toUTCString() + "; path=/";
	}
	else
	{
		var exdate = new Date();
		exdate.addHours(expirehours)
    	document.cookie = c_name + "=" + escape(value) + ";expires=" + exdate.toUTCString() + "; path=/";
		//document.cookie = c_name + "=" + escape(value) + ((expirehours == null) ? "" : ";expires=" + exdate.toUTCString());
	}
}
function js_getCookie(c_name) {
    if (document.cookie.length > 0) {
        c_start = document.cookie.indexOf(c_name + "=");
        if (c_start != -1) {
            c_start = c_start + c_name.length + 1;
            c_end = document.cookie.indexOf(";", c_start);
            if (c_end == -1) c_end = document.cookie.length;
            return unescape(document.cookie.substring(c_start, c_end));
        }
    }
    return "";
}
function js_removeCookie(c_name) {
    js_setCookie(c_name, null, -1000);
}

Date.prototype.addHours= function(h){
    this.setHours(this.getHours()+h);
    return this;
}

String.prototype.setCharAt = function(idx, chr) {
	if(idx > this.length - 1){
		return this.toString();
	} else {
		return this.substr(0, idx) + chr + this.substr(idx + 1);
	}
};