循环不断显示图片

< div  id ="demo"  style ="OVERFLOW:hidden;WIDTH:800px;COLOR:#ffffff" >
                                 < table  cellpadding ="0"  cellspacing ="0"  border ="0" >
                                     < tr >
                                         < td  id ="demo1"  valign ="top"  align ="center" >
                                             < table  cellpadding ="2"  cellspacing ="0"  border ="0" >
                                                 < tr  align ="center" >
                                                     < td >
   图片地址
</ td >
                                                 </ tr >
                                             </ table >
                                         </ td >
                                         < td  id ="demo2"  valign ="top" ></ td >
                                     </ tr >
                                 </ table >
                             </ div >
                             < script >
                                var speed=2//速度数值越大速度越慢
                                demo2.innerHTML=demo1.innerHTML
                                function Marquee(){
                                if(demo2.offsetWidth-demo.scrollLeft<=0)
                                demo.scrollLeft-=demo1.offsetWidth
                                else{
                                demo.scrollLeft++
                                }
                                }
                                var MyMar=setInterval(Marquee,speed)
                                demo.onmouseover=function() {clearInterval(MyMar)}
                                demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
                             </ script >