var GSFN;

if(GSFN == undefined) {
	 GSFN = {};
	
	 GSFN.gId = function(id) {
	 	return document.getElementById(id);
     };

	 GSFN.hasClassName = function(element, className) {
		 var elementClassName = element.className;
		
		 return (elementClassName.length > 0 && (elementClassName == className ||
		 new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
	 };

	 GSFN.addClassName = function(element, className) {
		 if (!GSFN.hasClassName(element, className))
		 	element.className += (element.className ? ' ' : '') + className;
		 return element;
	 };

	 GSFN.removeClassName = function(element, className) {
		 var newClass = GSFN.strip(element.className.replace(new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' '));
		 element.className = newClass;
		 return element;
	 };

	 GSFN.strip = function(string) {
	 	return string.replace(/^\s+/, '').replace(/\s+$/, '');
	 };
}

GSFN.feedback = function(tab_options) {
	 this.empty_url = "images/transparent.gif";
	 //this.feedback_url = url;
	 this.tab_options = tab_options ? tab_options : {};
	 this.tab_options.placement = this.tab_options.placement ? this.tab_options.placement : 'left';
	 this.tab_options.color = this.tab_options.color ? this.tab_options.color : '#222';
	
	 this.overlay_html = '<div id="fdbk_overlay" style="display:none">' +
		 '<div id="fdbk_container">' +
		 '<iframe src="' + this.empty_url + '" id="fdbk_iframe" allowTransparency="true" scrolling="no" frameborder="0" class="loading"></iframe>' +
		 '</div>' +
		 '<div id="fdbk_screen"></div>' +
		 '</div>';
	
	 if(this.tab_options.container) {
		 var container_el = this.gId(this.tab_options.container);
		 container_el.innerHTML = this.overlay_html;
	 } else {
		 document.write(this.overlay_html);
	 }
	
	 //this.gId('fdbk_tab').onclick = function() { GSFN.show(); return false;}
	 this.gId('fdbk_iframe').setAttribute("src", this.empty_url);
};

GSFN.set_position = function() {
	 this.scroll_top = document.documentElement.scrollTop || document.body.scrollTop;
	 this.scroll_height=document.body.scrollHeight;
	 this.client_height = window.innerHeight || document.documentElement.clientHeight;
	 this.gId('fdbk_screen').style.height = this.scroll_height+"px";
	 this.gId('fdbk_container').style.top = this.scroll_top+(this.client_height*0.1)+"px"; 
};

GSFN.show = function(url,height) {
	 this.gId('fdbk_iframe').setAttribute("src", url);
	 if (this.gId('fdbk_iframe').addEventListener) {
	 	this.gId('fdbk_iframe').addEventListener("load", GSFN.loaded, false);
	 } else if (this.gId('fdbk_iframe').attachEvent) {
	 	this.gId('fdbk_iframe').attachEvent("onload", GSFN.loaded);
	 }

     this.gId('fdbk_container').style.height=height;
     
	/*
	 if(url.search("VDCDemoRequest.jsp")!=-1){
		 this.gId('fdbk_container').style.height=460;
	 }else{
	 	this.gId('fdbk_container').style.height=620;
	 }*/
	 
	 this.set_position();
	
	 GSFN.addClassName(document.getElementsByTagName('html')[0], 'feedback_tab_on');
	 this.gId('fdbk_overlay').style.display = "block";
};

GSFN.hide = function() {
	 if (GSFN.gId('fdbk_iframe').addEventListener) {
	 GSFN.gId('fdbk_iframe').removeEventListener("load", GSFN.loaded, false);
	 } else if (GSFN.gId('fdbk_iframe').attachEvent) {
	 GSFN.gId('fdbk_iframe').detachEvent("onload", GSFN.loaded);
	 }
	 this.gId('fdbk_overlay').style.display = "none";
	 this.gId('fdbk_iframe').setAttribute("src", this.empty_url);
	 GSFN.gId('fdbk_iframe').className = "loading";
	
	 GSFN.removeClassName(document.getElementsByTagName('html')[0], 'feedback_tab_on');
};

GSFN.loaded = function() {
 	GSFN.gId('fdbk_iframe').className = "loaded";
};