//上一张 下一张
function prevPic(){
document.getElementById('MarqueePictues').scrollLeft-=110;
}
function nextPic(){
document.getElementById('MarqueePictues').scrollLeft+=110;
}//鼠标长按事件
var Mar;
function downprevMouse(){Mar = setInterval("prevPic()",150);}
function downnextMouse(){Mar = setInterval("nextPic()",150);}
function upMouse(){clearInterval(Mar);}//图片更换
function changePic(str1,str2){
document.getElementById("showpic").setAttribute("src",str1.getAttribute("src"));
str1.style.border = "#FF0000 1px dashed";
//滚动条的位置根据当前是第几张图片来确定
document.getElementById('MarqueePictues').scrollLeft = (str2-3)*110;
}