little javascript error (Value turns to "false" ?) :Never mind :D

[wpearsall]

OK, i have a text box on a form,

And i want to check if the form's textbox is a valid username, so i check its length & that, using JavaScript, and then if its valid length, i open a "invisible" window, to check if the username is in user, or if it is banned (IE: admin / administrator not allowed)

any how's, I know that the form's value is being presented to the script properly, as the "alert(namevalue) is givin the propa text input, but the actual window that is opening, is going to &username=false

<script language=javaScript TYPE="text/javascript">
<!--

function check_username(namevalue){
                // Returns the actual value
	alert(namevalue);
                // if the actual isnt > 2, it will msgbox
	if(namevalue = "" || namevalue.length < 3){
		alert("Username must be at least 3 characters long!");
	}else{
                                // seams to totally crap out here for some reason?
		window.open("http://ew-search.realm-ed.co.uk:88/members/register.php?op=check_name&amp;username=" + namevalue, "popupnamecheck", "width=1,height=7,location=0,menubar=0,resizable=0,scrollbars=1,status=0,titlebar=1,toolbar=0");
	}
}
// -->
</script>

is it something wrong with this code?

cuz i am at a loss, it was working b4, but suddenly, crap-out-arini

TA

[wpearsall]

OK, never mind

// this
	if(namevalue = "" || namevalue
//needed to be this
	if(namevalue == "" || namevalue

(damn double = )