using variables in javascript

howdy,
I am attempting to write a script that determines the screen resolution but am having problems using the variables I have created.

var screenw = (window.screen.width)
var screenh = (window.screen.height)

window.open(a, 'determined','toolbar=yes,scrollbars=yes,resizable=yes,location=yes,directories=yes,menubar=yes,stat us=yes,width=screenw,height=screenh');


when I use this I get a very small window opened. What am I doing wrong here?


thanks.

window.open(a, 'determined','toolbar=yes,scrollbars=yes,resizable=yes,location=yes,directories=yes,menubar=yes,stat us=yes,width='+screenw+',height='+screenh);


must be used as variables not just as part of the string

that did the trick thanks alot.