function openSurveyChoice(){
	ck = readSurveyCookie();
	if(!ck){
		window.open('http://www.library.nd.edu/eresources/survey/survey_choice.shtml', "surveyChoice", 'location=1,toolbar=1,status=1,menubar=1,resizable=1,scrollbars=1,titlebar=1,width=1000,height=600');
	}
}

function chooseSurvey(choice){
	var exdate=new Date();
	exdate.setDate(exdate.getDate()+365);
	document.cookie="surveychoice=" + escape(choice) + ";path=/" + ";domain=library.nd.edu" + ";expires="+exdate.toGMTString();
	if(choice == 'yes'){
		document.location="http://www.library.nd.edu/eresources/survey";
	}else{
		self.close();
	}
}

function readSurveyCookie(){
	if (document.cookie.length>0){
 		c_start=document.cookie.indexOf("surveychoice=");
  		if (c_start!=-1){ 
    			c_start=c_start + "surveychoice=".length; 
  			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 "";
}