用roll.js实现的图片自动滚动+鼠标触动的特效

<!--  
var sh;  
marqueesWidth=533;  
preLeft=0; currentLeft=0; stopscroll=false; getlimit=0;preTop=0; currentTop=0;  

function scrollLeft()  
{  
    if(stopscroll==true) return;  
    preLeft=marquees.scrollLeft;  
    marquees.scrollLeft+=2;  
    if(preLeft==marquees.scrollLeft)  
    {  
        //marquees.scrollLeft=templayer.offsetWidth-marqueesWidth+1;  
    }  
}  

function scrollRight()  
{  
    if(stopscroll==true) return;  

    preLeft=marquees.scrollLeft;  
    marquees.scrollLeft-=2;  
    if(preLeft==marquees.scrollLeft)  
    {  
        if(!getlimit)  
        {  
            marquees.scrollLeft=templayer.offsetWidth*2;  
            getlimit=marquees.scrollLeft;  
        }  
        marquees.scrollLeft-=1;  
    }  
}  

function Left()  
{  
    stopscroll = false;  
    sh = setInterval("scrollLeft()",20);  
}  

function Right()  
{  
    stopscroll = false;  
    sh = setInterval("scrollRight()",20);  
}  

function StopScroll()  
{  
    stopscroll = true;  
    clearInterval( sh );  
}  
function SelectType(value)  
{  
    document.all.sendForm.page.value = 1;  
    document.all.sendForm.type.value = value;  

    document.all.sendForm.submit();  
}  

function init()  
{  
    with(marquees)  
    {  
        style.height=0;  
        style.width=marqueesWidth;  
        style.overflowX="hidden";  
        style.overflowY="visible";  
        style.align = "center";  
        noWrap=true;  
    }  
}  
//-->