Jump Menu Open New Window

I have a jump menu on my page and it works fine, but I want the selections in the menu to open in a new browser window. How do I do that?

<script>
function MM_jumpMenu(targ,selObj,restore){ //v3.0
eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
if (restore) selObj.selectedIndex=0;
}
//-->
</script>

<form name="form1" method="post" action="">
<div align="right"><select name="form1" class="box" onChange="MM_jumpMenu('parent',this,0)">
<option value=http://www.1stoption.com>-- Option 1</option>
<option value=http://www.2ndoption.com>-- Option 2</option>
</select>
</div>
</form>