c# - asp.net and javascript please advise -

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i new javascript , having problems.

my mission create mouseover , mouseout script having difficulty with,

my aspx code 

<div>     <div id="div_img" style="height: 300px; width: 300px; border: solid 1px black;   position: absolute;             visibility: hidden;">         <img src="" id="img_tool" />     </div> </div>  <script type="text/javascript" language="javascript">          function showtooltip(con) {         console.log(getoffset(con).left + '-' + getoffset(con).top);             document.getelementbyid("div_img").style.visibility = "visible";             document.getelementbyid("img_tool").src = con.src;             document.getelementbyid("div_img").style.left = getoffset(con).left - 300 + 'px';             document.getelementbyid("div_img").style.top = getoffset(con).top - 300 + 'px';             document.getelementbyid("div_img").style.zindex = "0";             console.log(document.getelementbyid("div_img").style.left +'-'+document.getelementbyid("div_img").style.top)         }         function hidetooltip() {             document.getelementbyid("div_img").style.visibility = "hidden";         }          function getoffset( el ) {             var _x = 0;             var _y = 0;             while( el && !isnan( el.offsetleft ) && !isnan( el.offsettop ) ) {                 _x += el.offsetleft - el.scrollleft;                 _y += el.offsettop - el.scrolltop;                 el = el.offsetparent;             }             return { top: _y, left: _x };         }  </script>

and code behind c# 

 if ((e.row.rowtype.tostring() != "header") && (e.row.rowtype.tostring() != "footer"))  {       imagebutton ib = (imagebutton)e.row.cells[3].controls[0];       ib.attributes.add("onmouseover", "showtooltip(this);");       ib.attributes.add("onmouseout", "hidetooltip();");

i have no idea next.. please

you can directly add these events img_tool in aspx :

<img src="" id="img_tool" onmouseover="showtooltip(this);" onmouseout="hidetooltip();" />

plus, if want access controls (web controls or html elements) in code behind, have add attribute runat="server" :

<img src="" id="img_tool" runat="server"/>

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