var ai=0;
var tt=0;
function MoveDiv(){
	var bgObj=document.getElementById('Listarticle');
	var bgObjunderstand=document.getElementById('understand');
	var bgObjlinks=document.getElementById('links');
	var bgObjGoogleweb=document.getElementById('Googleweb');
	
	if (tt>0) {
	
		bgObj.style.marginTop=bgObj.offsetTop - ai + "px";
		bgObjunderstand.style.marginTop=bgObjunderstand.offsetTop - ai + "px";
		bgObjlinks.style.marginTop=bgObjlinks.offsetTop - ai + "px";
		bgObjGoogleweb.style.marginTop=bgObjGoogleweb.offsetTop - ai + "px";	
			
		tt=tt-ai;
		if (ai>1) {ai=ai-1;}
	}
	//
	
	if (0-bgObj.offsetTop>bgObj.offsetHeight-1){bgObj.style.marginTop= "0px";}
	if (0-bgObjunderstand.offsetTop>bgObjunderstand.offsetHeight-1){bgObjunderstand.style.marginTop= "0px";}
	if (0-bgObjlinks.offsetTop>bgObjlinks.offsetHeight-1){bgObjlinks.style.marginTop= "0px";}	
	if (0-bgObjGoogleweb.offsetTop>bgObjGoogleweb.offsetHeight-1){bgObjGoogleweb.style.marginTop= "0px";}	

}

function test(){
	var bgObj=document.getElementById('Listarticle');
	alert(bgObj.offsetTop);//5
	alert(bgObj.offsetHeight);//247
}

setInterval('MoveDiv()',10)
function startmove(){
tt=84;
ai=11;
}
setInterval('startmove()',7000)


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