var touchtimer, 
    flagLock,
    touchduration = 500;

var onlongtouch = function() { 
    alert("Long Touch!!"); 
};

function touchstart(e) {
    e.preventDefault();
	
    if(flagLock){
	return;
    }
	
   touchtimer = setTimeout(onlongtouch, touchduration); 
   flagLock = true;
}

function touchend() {
    if (touchtimer){
       clearTimeout(touchtimer);
       flagLock = false;
    }
}

window.onload = function () {
    window.addEventListener("touchstart", touchstart, false);
    window.addEventListener("touchend", touchend, false);
};