Thanks for the help,
I know for you this is very easy but I´m a bit comfused

How do I make this code work on a image(button) in html
on (release) {
getURL ("javascript:NewWindow=window.open('site.html','newWin','width=780,height=560,left=0,top=0,toolbar=No,location=No,scrollbars=No,status=No,resizable=No,fullscreen=No'); NewWindow.focus(); screen_height = window.screen.availHeight; screen_width = window.screen.availWidth; left_point = parseInt(screen_width/2)-(780/2); top_point = parseInt(screen_height/2)-(560/2); setTimeout('NewWindow.moveTo(left_point,top_point)',100); void(0);");
}