请大大帮我分析一下这段javascript代码
大大帮我看一下这段代码与图片之间的关系，谢谢 ~youarebe:
代碼:
<script language="javascript">
var page = 1;
var s = location.search.substring(1,location.search.length);
if (!isNaN(s) && s != "")
{
if (( s > 0 ) && ( s <= datas.length + 1 ))
{
page = s;
}
}
function MM_findObj(n, d) { //v4.01
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_showHideLayers() { //v6.0
var i,p,v,obj,args=MM_showHideLayers.arguments;
for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args [i+2];
if (obj.style) { obj=obj.style; v=(v=='show')?'block':(v=='hide')?'none':v; }
obj.display=v; }
}
function foo(o)
{
var v = parseInt(o.width);
if (v > 720)
{
document.all.it1.width = v;
document.all.it2.width = v+70
}
MM_showHideLayers('Layer2','','hide');
tmp=0;
}
function showpic(v)
{
var nl = new String(window.location);
if (nl.indexOf("?") >-1)
{
nl = nl.substring(0,nl.indexOf("?"));
}
nl = nl+'?'+v;
//alert (nl);
window.location = nl;
}
function ch_sel(v)
{
document.all.select1.value = v;
document.all.select2.value = v;
}
function get_sel(v)
{
if (v == 0)
{
//document.write
var i,outstr = "";
for (i=1;i<datas.length;i++)
{
outstr += "<option value='"+ i +"'>第"+ i +"页</option>";
}
document.write(outstr);
}
else
{
if ((v > 0) && (v < datas.length+1))
{
page = v;
showpic(v);
ch_sel(v);
}
}
}
function prevpage()
{
page--;
if (page <1)
{
alert('到头咧');
page = 1;
}
else
{
//alert(page);
ch_sel(page);
showpic(page);
}
}
function nextpage()
{
page++;
//alert (page);
if (page >= datas.length )
{
alert('到头咧');
page = datas.length-1;
}
else
{
//alert(page);
ch_sel(page);
showpic(page);
}
}
function keylock()
{
if((event.keyCode == 78 || event.keyCode == 110) && (event.ctrlKey))
{
event.returnValue = false;
}
if((event.keyCode == 121) && (event.shiftKey))
{
event.returnValue = false;
}
}
function keyUp()
{
if (window.event.keyCode == 93)
{
addFavorite();
}
if (window.event.keyCode == 17)
{
if (tmp == 1)
document.getElementById("next").click();
tmp = 1;
}
if (window.event.keyCode == 16)
{
if (tmp == 3)
document.getElementById("prev").click();
tmp = 3;
}
}
</script>
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