Only one center window is displayed in Js.

VaR newwindow; // defines a window, facilitating inter-window communication <br/> function makenewwindow (URL) {<br/> If (! Newwindow | newwindow. closed) {<br/> var width = 400; <br/> var Height = 300; <br/> var left = parseint (screen. availwidth/2)-(width/2); // center the screen <br/> var Top = parseint (screen. availheight/2)-(height/2); <br/> var windowfeatures = "width =" + width + ", Height =" + height + ", status, resizable, left = "+ Left +", Top = "+ TOP +" screenx = "+ Left +", screeny = "+ top; <br/> newwindow = Window. open (UR L, "subwind", windowfeatures); <br/>}else {<br/> // window is already open, so bring it to the front <br/> newwindow. focus (); <br/>}</P> <p> <script language = "JavaScript"> <br/> <! -- <Br/> window. open ('page.html ', 'newwindow', 'height = 100, width = 400, Top = 0, Left = 0, toolbar = No, menubar = No, scrollbars = No, resizable = No, location = No, status = no ') <br/> // write a line <br/> --> <br/> </SCRIPT> </P> <p> <script language = "JavaScript"> Javascript script starts.; <br/> window. open the command to pop up a new window; <br/> name of the page.html pop-up window; <br/> name of the newwindow pop-up window (not a file name), optional, can be replaced by null; <br/> Height = 100 window height; <br/> width = 400 window width; <br/> Top = 0 window away from the screen <Br/> left = 0. The pixel value on the left of the window is displayed. <br/> toolbar = No indicates whether to display the toolbar. Yes indicates whether to display; <br/> menubar and scrollbars indicate the menu bar and scroll bar. <Br/> resizable = No: whether to change the window size; yes: Yes; <br/> location = No: whether to display the address bar; yes: Yes; <br/> Status = No: whether to display information in the status bar (usually the file has been opened). Yes indicates yes; <br/> </SCRIPT> end of JS script </P> <p>