Pop Up Window

on (release) {
getURL ("javascript:NewWindow=window.open('http://www.yahoo.ca/','Direction','width=400,height=300,left=0,top=0,toolbar=No,location=No,scrollbars=No,status=No,resizable=No,fullscreen=No'); NewWindow.focus();	setTimeout('NewWindow.close()',6000); screen_height = window.screen.availHeight; screen_width = window.screen.availWidth; left_point = parseInt(screen_width/2)-(400/2); top_point = parseInt(screen_height/2)-(300/2); setTimeout('NewWindow.moveTo(left_point,top_point)',100); void(0);");
}

Instead of poping up an external page, I want to pop up a page within my own site. How should I change it? I was thinking to change to http://mydomain/page.htm/, is there a better way?