iFrame.src truncating get variables?

I have the following code to set开发者_如何学Python the src of an iFrame

    alert(this.options.url);
    this.iframe.src = url || this.options.url;

The alert reads

user_messages_new.php?to_user=bob marley&to_id=abatu&

The source produced (firebug) reads

src="javascript:false;"

And the iFrame loads

user_messages_new.php

What the hell is going on?

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I think you want to change this.iframe.src = url || this.options.url; to this.iframe.src = this.options.url; If "url" were null, your code would work as is, but since it's false, it isn't working.