lastScrollY = 0; function heartBeat(){ var diffY; if (document.documentElement && document.documentElement.scrollTop) diffY = document.documentElement.scrollTop; else if (document.body) diffY = document.body.scrollTop percent=.1*(diffY-lastScrollY); if(percent>0){ percent=Math.ceil(percent); } else{ percent=Math.floor(percent); } //document.getElementById("leftDiv").style.top = parseInt(document.getElementById("leftDiv").style.top)+percent+"px"; document.getElementById("rightDiv").style.top = parseInt(document.getElementById("rightDiv").style.top)+percent+"px"; lastScrollY=lastScrollY+percent; } //del this,the div won't float window.setInterval("heartBeat()",1); //close button function close_left(){ document.getElementById('left1').style.visibility='hidden'; } function close_right(){ document.getElementById('right1').style.visibility='hidden'; } //css set document.writeln("