//0 means disabled; 1 means enabled; 
var popupStatus = 0;

//Hook in the form popup event
function enablePopup() {
	//centering with css
	centerPopup();
	//load popup
	loadPopup();
	//return false;
	return false;
};

//enable the popup form
function loadPopup() {
	//loads popup only if it is disabled
	if (popupStatus == 0) {
		$("#backgroundPopup").css({"opacity": "0.7"});
		$("#backgroundPopup").fadeIn("slow");
		$("#requestFormPopup").fadeIn("slow");
		popupStatus = 1;
	} 
};

//disable the popup form
function disablePopup() {
	//disables popup only if it is enabled
	if (popupStatus == 1) {
		$("#backgroundPopup").fadeOut("slow");
		$("#requestFormPopup").fadeOut("slow");
		popupStatus = 0;
	}
};			

//centering popup
function centerPopup(){
	//request data for centering
	var windowWidth = document.documentElement.clientWidth;
	var windowHeight = document.documentElement.clientHeight;
	var popupHeight = $("#requestFormPopup").height();
	var popupWidth = $("#requestFormPopup").width();

	//centering
	$("#requestFormPopup").css({
			"position": "absolute", 
			"top": windowHeight/2-popupHeight/2, 
			"left": windowWidth/2-popupWidth/2});
	//only need force for IE6		
	$("#backgroundPopup").css({"height": windowHeight});
};