<script language="javascript" defer> var zhang=2 function next(){ if(zhang==7){ alert("这已经是最后一张了!") zhang=6 } document.getElementById("tu").src=zhang+".jpg" text.innerHTML="当前是第"+zhang+"张图片" zhang++ } function up(){ if(zhang==2){ alert("这已经是第一张了!") zhang=3 } document.getElementById("tu").src=(zhang-2)+".jpg" text.innerHTML="当前是第"+(zhang-2)+"张图片" zhang-- } </script> <style type="text/css"> #divall { position:relative; } #divleft { border:1px red solid; border-right:0px red solid; background: url(bg.gif); cursor:url("2.cur"); position:absolute; top:0px; z-index:2007; text-align:right; padding:0px } #divright { border:1px red solid; border-left:0px red solid; background: url(bg.gif); cursor:url("1.cur"); top:0px; position:absolute; z-index:2007 text-align:center; padding:0px } #tu{z-index:-2007} </style> <div id="text"  >当前是第1张图片</div> <div id="divall"> <img src="1.jpg" id="tu"> <div id="divleft" title="上一张" onmouseover="show_div('divleft','left.gif')" onmouseout="hide_div('divleft')" onclick="up()"> </div> <div id="divright" title="下一张"  onmouseover="show_div('divright','right.gif')" onmouseout="hide_div('divright')" onclick="next()"> </div> </div> <script>// var w=document.getElementById("tu").width//500 var h=document.getElementById("tu").height//400 document.getElementById("tu").style.width=w document.getElementById("tu").style.height=h //document.getElementById("divleft").style.visibility='hidden' document.getElementById("divleft").style.width=w/2 document.getElementById("divleft").style.height=h document.getElementById("divleft").style.left=0 //document.getElementById("divright").style.visibility='hidden' document.getElementById("divright").style.width=w/2 document.getElementById("divright").style.height=h document.getElementById("divright").style.left=w/2 //document.write("<style> #tu{width:"+w+"px; height:"+h+"px;z-index:2000}</style>") function show_div(id,img){ document.getElementById(id).innerHTML="<img src="+img+">" } function hide_div(id){ document.getElementById(id).innerHTML="" } </script>