js 图片放大效果 修正版

<div style="border:1px solid #CCC;position:absolute; width:200px; height:100px; cursor:move;" id="jelle_test_divquot;>
这个DIV 可以移动，你可以测试下。
</div>
<script type="text/javascript">
var getMouseP=function (e){//获取鼠标坐标 请传递evnet参数
e = e || window.event;
var m=(e.pageX || e.pageY)?{ x:e.pageX,y:e.pageY } : { x:e.clientX + document.body.scrollLeft - document.body.clientLeft,y:e.clientY + document.body.scrollTop - document.body.clientTop };
return m;
};
move=function(o,t){
o=$j(o);
t=$j(t);
o.onmousedown=function(ev){
var mxy=getMouseP(ev);//获取当前鼠标坐标
var by={x:mxy.x-(t.offsetLeft),y:mxy.y-(t.offsetTop)};
o.style.cursor="move";
document.onmousemove=function(ev){
var mxy=getMouseP(ev);
t.style.left=mxy.x-by.x+"px";
t.style.top=mxy.y-by.y+"px";
};
document.onmouseup=function(){
window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
this.onmousemove=null;
}
}
}
move("jelle_test_div","jelle_test_div");
</script>

<div style="border:1px solid #CCC; width:500px; height:415px; background:url(xxx/c.jpg);" id="jelle_warpper">
<div style="width:100px; height:50px; border:1px solid #CCC;" id="jelle_move"></div>
</div>
<script type="text/javascript">
var mp=function (e){//获取鼠标坐标 请传递evnet参数
e = e || window.event;
var m=(e.pageX || e.pageY)?{ x:e.pageX,y:e.clientY + document.body.scrollTop - document.body.clientTop };
return m;
}
var move2=function(o,t){//请提前设置CSS position:absolute;并激活filter:alpha(opacity=100);
//o相应鼠标拖动的区域ID T被移动对象的ID
o=$j(o);
t=$j(t);
by_o={x:o.offsetLeft,y:o.offsetTop};
o.onmousemove=function(ev){
//var mxy=Jelle.getMouseP(ev);//获取当前鼠标坐标
var by={x:t.offsetLeft,y:t.offsetTop};
var ms=mp(ev);
t.innerHTML=(by_o.x-by.x)+"---"+(by_o.x-by.y);
jy=ms.y-by_o.y-25;
jx=ms.x-by_o.x-50;
maxy=415-50;//减去移动框的高度
maxx=500-100;//减去移动框的宽度
var y=jy>=maxy?maxy:jy<=0?0:jy;
var x=jx>=maxx?maxx:jx<=0?0:jx;
t.style.marginTop=y+"px";
t.style.marginLeft=x+"px";
}
}
move2("jelle_warpper","jelle_move")
</script>