HTML登陆框

<SCRIPT language=JavaScript> 
	var speed=20;
	var temp=new Array(); 
	var clipright=document.body.clientWidth/2,clipleft=0 
	for (i=1;i<=2;i++){ 
		temp[i]=eval("document.all.div"+i+".style");
		temp[i].width=document.body.clientWidth/2;
		temp[i].height=document.body.clientHeight;
		temp[i].left=(i-1)*parseInt(temp[i].width);
	} 
	function openit(){ 
		clipright-=speed;
		temp[1].clip="rect(0 "+clipright+" auto 0)";
		clipleft+=speed;
		temp[2].clip="rect(0 auto auto "+clipleft+")";
		if (clipright<=0)
			clearInterval(tim);
	} 
	tim=setInterval("openit()",100);
</SCRIPT>