JavaScript check picture size don't let big picture burst page

How to use JavaScript to determine the size of the picture, in fact, as long as a simple function can be written, of course, so how to write a lot of people may not know. found that the use of ASP to determine the size of the picture yaks still complicated, and judged on the judgment, but also the logical display ... Bother. Use Javascript to judge, easy to handle, the ultimate effect is nothing but the big picture to burst the page.

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<script language= "JAVASCRIPT" >   /Check picture size Greater than expected size, greater than expected size    function show (chkw) {//chk images width    if (chkw>500) {   chk w=500;   }    else {   chkw=chkw   }    return chkw;   }//shawl.qiu script   //example    </script>    1." Mouse Automatically selected check box:    <input type= checkbox "Onmousemove=" Checked=true ">    <input type=" checkbox "onmousemove=" Checked=true ">    2.ACCESS list days of day of week   //This algorithm can cost me a few hours    Query data for all days of the week for a date    SELECT *    from ctdate_by_query_date    WHERE DateAndTime bet Ween ((#2006 -5-15#+weekday (2006-5-15))-6) and #2006 -5-15#+weekday (2006-5-15)    3. Double-click the mouse to copy the text, now double click on the clear    <script language= "JAVASCRIPT" >    function ClipBoard (tdobj) {//ie only    var holdtext = document.all[' Holdtext '];    holdtext.innertext = Tdobj.innertext;    Copied = Holdtext.createtextrange ();    Copied.execcommand ("Copy");    alert ("text copied");       </script>    <form name= "Form1" method= "Post" action= "" >    <ttextarea id= "Holdtext" style= "Display:none" rows= "ten" ></ttextarea>    </form>