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function view(){
var $img = new Image();
var x = document.getElementById("img4");
$img.src = x.src;
var $w, $h, wContainer, hContainer;
wContainer = 200;
hContainer = 200;
$w = $img.width;
$h = $img.height;
if ($w > wContainer) {
$h = $h * (wContainer / $w);
$w = wContainer;
if ($h > wContainer) {
$w = $w * (hContainer / $h);
$h = hContainer;
}
} else if ($h > hContainer) {
$w = $w * (hContainer / $h);
$h = hContainer;
if ($w > wContainer) {
$h = $h * (wContainer / $w);
$w = wContainer;
}
}
x.style.width = $w;
x.style.height = $h;
}
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td valign="middle" align="center" >
<img id="img4" src='/uploadfiles/businessinfoimages/<%#Eval("pic1_mark") %>' onclick=" Cerimg()"
onerror="this.style.display='none';" onload="view()" alt='<%#Eval("name") %>' />
<br /><font onclick="Cerimg()" >点击浏览大图</font></td>
<td width="100px"><table width="100%" border="0" style="cursor:hand;" cellspacing="0" cellpadding="0">
<tr style="padding-top:5px; padding-bottom:5px;" >
<td><img id="img1" src='/uploadfiles/businessinfoimages/<%#Eval("pic1_small") %>' class="dk"
onclick="javascript:document.getElementById('img4').src = '/uploadfiles/businessinfoimages/<%#Eval("pic1_mark") %>';"
onerror="this.style.display='none';" alt='浏览大图' /></td>
</tr>
<tr style="padding-top:5px; padding-bottom:5px;">
<td><img id="img2" src='/uploadfiles/businessinfoimages/<%#Eval("pic2_small") %>' class="dk"
onclick="javascript:document.getElementById('img4').src = '/uploadfiles/businessinfoimages/<%#Eval("pic2_mark") %>';"
onerror="this.style.display='none';" alt='浏览大图' /></td>
</tr>
<tr style="padding-top:5px; padding-bottom:5px;">
<td><img id="img3" src='/uploadfiles/businessinfoimages/<%#Eval("pic3_small") %>' class="dk"
onclick="javascript:document.getElementById('img4').src = '/uploadfiles/businessinfoimages/<%#Eval("pic3_mark") %>';"
onerror="this.style.display='none';" alt='浏览大图' /></td>
</tr>
</table>
<img id="img4" src='/uploadfiles/businessinfoimages/<%#Eval("pic1_mark") %>' onclick=" Cerimg()"
onerror="this.style.display='none';" onload="view()" alt='<%#Eval("name") %>' />