How to get around IE Jump Menu Issues?

When I am using a Jump Menu in IE, it opens the new document in a "Window"

I want to open the my Jump Menu links like a normal web page that is not constricted to a window frame. I am linking directly to PDF's and when opened, they open in frames that are constrained to a size which cannot be resized. This does not happen in firefox. The PDF window can be resized to any size I need by pulling on the corner of the window. Is there a way to get around this annoying IE issue? Here is the javascript that is currently in the header.

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

function fnlink(){

window.open (document.frmmenu.jumpMenu.value,'mywindow','status=1,toolbar=1')
}
//-->
</script>

try:

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

function fnlink(){

window.open (document.frmmenu.jumpMenu.value)
}
//-->
</script>