small problem greenz for answer

I have a small problem with a form, it works in FF but not in IE.

I have a select menu

 
<select name="system" id="system">
   <option value="/resources/bmicalculator.php" <?php if ($system=="us") {} else {echo "selected";}?> onClick="jump('/resources/bmicalculator.php');">Metric System</option>
   <option value="/resources/bmicalculator.php?system=us" <?php if ($system=="us") {echo "selected";}?> onClick="jump('/resources/bmicalculator.php?system=us');">US System</option>                                                                                               </select>

Code (markup):

when somebody clicks on one of the selections it jumps them to a different page with the following js

function jump(address)
{
document.location.href=address;
}

Code (markup):

any idea whats wrong?

 

Do

<select name="system" id="system" onchange="jump(this.value);">

HTML:

EDIT:

And it should be window.location

 

I use the following:

<select name="system" id="system" onchange="jump(this.value);"  onFocus="jump(this.value);">

Code (markup):