Multi-tab AJAX

//function to get random number
function randomXToY(minVal,maxVal,floatVal)
{
  var randVal = minVal+(Math.random()*(maxVal-minVal));
  return typeof floatVal=='undefined'?Math.round(randVal):randVal.toFixed(floatVal);
}

//function to get unixtimestamp
function getUnixTimestamp() {
        var ts = Math.round(new Date().getTime() / 1000);
        return ts;
}

function doPMCheck() {

        /*GET THE TIME THE LAST AJAX CHECK OCCURED*/
        var lastChecked = $.cookie("lastPMCheckTime");
        
        /*GET THE TIME NOW AND SET A THRESHOLD BOTTOM BOUNDARY FOR TWO MINUTES*/
        var timeNow = getUnixTimestamp();
        var threshHold = timeNow - 120;

        /*IF THE LAST CHECK OCCURED MORE THAN 2 MINUTES AGO, CHECK FOR PMS*/
        if(lastChecked < threshHold) {
        
                /*UPDATE THE COOKIE TIME*/
                $.cookie("lastPMCheckTime", timeNow);

                /*THIS IS WHERE YOU PERFORM THE AJAX CHECK*/

        }

        /*TRY TO UPDATE AGAIN IN 60-120 SECONDS*/
        var newCheckTime = randomXToY(60,120) * 1000;
        setTimeout("doPMCheck()", newCheckTime);
}


$(document).ready(function() {

        /*SINCE THE PAGE JUST LOADED DON'T CHECK FOR NEW PMS YET, DO IT IN 1-2 MINUTES*/
        var firstCheckTime = randomXToY(60,120);
        setTimeout("doPMCheck()", firstCheckTime);
});