Here is my code:

Code:
function menu(dropdown) {
	var myindex  = dropdown.selectedIndex
	var SelValue = dropdown.options[myindex].value
	if (SelValue == "no") {
		alert("Please select an item to view information")

	} else {
		var url = "pizza.php?request=menu&mvalue=" + SelValue
		window.open(url,'mywindow','width=225,height=250 toolbar=no statusbar=no')
		return true;
	 }

}
and the link which I use to call this code:

Code:
<a href='javascript:menu(document.menuForm.pizza_options);'>Link</a>
When I do this, everything goes as expected, except that "true" is written to the base window. Why does this happen and how can I fix it? Thanks