Need some help with removing "leave / stay on page" window

I am using the pinoy pop on exit plugin. it appears the author is ghost. not too familiar with java or coding in general. what happens is when the user tries to leave the site, i guess they are redirected to a url i specify. only problem is before they get there a window pops up saying do you want to leave or stay on the page. I can customize the message that get presented to the user above the buttons, but I would prefer this not even show at all. actually i really do not want to even give them the option. anyone help? the java is below. thx

function addLoadEvent(func) { var oldonload = window.onload; if (typeof window.onload != 'function') { window.onload = func; } else { window.onload = function() { if (oldonload) { oldonload(); }  func(); }}}
function addClickEvent(a,i,func) { if (typeof a[i].onclick != 'function') { a[i].onclick = func; } }
var theDiv = '<div id="PopupExitDiv"  style="display:block; width:100%; height:100%; position:absolute; background:#FFFFFF; margin-top:0px; margin-left:0px;" align="center">';
theDiv = theDiv + '<iframe src="'+redirectURL+'" width="100%" height="100%" align="middle" frameborder="0"></iframe>';
theDiv = theDiv + '</div>';
theBody = document.body; if (!theBody) {theBody = document.getElementById("body"); if (!theBody) {theBody = document.getElementsByTagName("body")[0];}}
var StopPop = false;
function ShowPopup(){ if(StopPop == false){ window.scrollTo(0,0);  StopPop=true; divtag = document.createElement("div"); divtag.setAttribute("id","PopupContainer"); divtag.style.position="absolute"; divtag.style.width="100%"; divtag.style.height="100%"; divtag.style.zIndex="99"; divtag.style.left="0px"; divtag.style.top="0px"; divtag.innerHTML=theDiv; theBody.innerHTML=""; theBody.topMargin="0px"; theBody.rightMargin="0px"; theBody.bottomMargin="0px"; theBody.leftMargin="0px"; theBody.style.overflow="hidden"; theBody.appendChild(divtag);
	if (/Firefox[\/\s](\d+\.\d+)/.test(navigator.userAgent)) {
		var ffversion=new Number(RegExp.$1);
		if (ffversion>=6) alert(popmsg);
	}
	return popmsg;
} }
var a = document.getElementsByTagName('A'); for (var i = 0; i < a.length; i++) { if(a[i].target !== '_blank') {addClickEvent(a,i, function(){ StopPop=true; });} else{addClickEvent(a,i, function(){ StopPop=false;});}}disablelinksfunc = function(){var a = document.getElementsByTagName('A'); for (var i = 0; i < a.length; i++) { if(a[i].target !== '_blank') {addClickEvent(a,i, function(){ StopPop=true; });} else{addClickEvent(a,i, function(){ StopPop=false;});}}}
addLoadEvent(disablelinksfunc);
disableformsfunc = function(){ var f = document.getElementsByTagName('FORM'); for (var i=0;i<f.length;i++){ if (!f[i].onclick){ f[i].onclick=function(){ StopPop=true; } }else if (!f[i].onsubmit){ f[i].onsubmit=function(){ StopPop=true; }}}}
addLoadEvent(disableformsfunc);
window.onbeforeunload = ShowPopup;

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