var IE = document.all?true:false;
var done = false;
window.onbeforeunload = doUnload;

var timeExp=2;
var ev;
if(!IE) {
    document.onmousemove = function(evt) {ev=evt;}
}

function survey() {
  if(!done) {
    done = true;
    createCookie('SGExitSurvey','done',timeExp);
    window.open('/exitPop.htm','SGPop','width=570,height=760').focus();
 }
}


function doUnload(e) {
    var my, mx, ycut;
    //alert('unload');
    if(IE) {
        my=event.clientY;
        mx=event.clientX;
        ycut=0;
    }
    else {
        my=ev.pageY;
        mx=ev.pageX;
        ycut=10;
    }
    //alert( e + ' Y=' + my + ' X=' + mx);
    if(readCookie('SGExitSurvey') != 'done') {
        var offPage=my<ycut && mx>50;
        if(surveySetPage) {
            if(offPage) survey();
            else createCookie('SGExitSurvey','fire',timeExp);
        }
        else {
            if(offPage && readCookie('SGExitSurvey') == 'fire') survey();
        }
    }
}

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
	//alert('Write ' + name + ':' + value);
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) {
		    //alert('Read ' + name + ':' + c.substring(nameEQ.length,c.length));
		    return c.substring(nameEQ.length,c.length);
		}
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}