一个窗口问题！在线等！！！！

Question

好像不行我OPEN出的的窗口都打不开了

Answer 1

window.open("Main.php","_self",url)
把上面的话改成下面这样就可以弹出来
window.open("Main.php","MAIN",url)
但是OPEN出来的窗口不能替换以前的窗口

Answer 2

url="status=yes,toolbar=no,scrollbars=no,location=no,menubar=no,resizable=yes," + "left=0,top=0,WIDTH=" + String(screen.width-10) + ",HEIGHT=" + String(screen.height-75)
                                window.open("Main.php","_self",url)
                                window.opener=null
怎么上面的语句打开的窗口不能不能应用我的url设置！