pull down menu & popup blocker problem

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Hi,

I have implemented 3 pull down menus to my website each calling a different method. Each pulldown menu has a series of values that lead the user to another site. My problem is that the only way they work is to right click on the popup blocker bar at the top of the page to allow popups. This is a problem because I need to implement it into a sharepoint webpart and the pages can not be blocked by a pop up blocker.

Is there a way to make the sites come up that are in the pulldown menu without a popup window??..that way they wont get blocked??

here is my html:

header:

function formHandler0(form)
{
var URL = document.form0.site0.options[document.form0.site0.selectedIndex].value;
window.location.href = URL;
}

body:

<input type=button value="Go" onClick="javascript:formHandler1(this)" target="_self" style="border: 2px ridge #FF9900">