var screen_height = window.screen.availHeight;
var screen_width = window.screen.availWidth;

var defaultWinWidth = screen_width*2/3;
var defaultWinHeight = screen_height*2/3;

var winX = screen_width/2-defaultWinWidth/2;
var winY = screen_height/2-defaultWinHeight/2;

var moviedefaultWinWidth = 700;
var moviedefaultWinHeight = 550;

var mwinX = screen_width/2-moviedefaultWinWidth/2;
var mwinY = screen_height/2-moviedefaultWinHeight/2;


var newwin;

var	winfeatures;
var winname;

function launchwin(winurl,width,height)
{
        //This launches a new window and then
        //focuses it if window.focus() is supported.
         if (newwin!=null && !newwin.closed){
         	newwin.close();
         	newwin=null;
         }
		
		if(width && height){
			winX = screen_width/2-width/2;
			winY = screen_height/2-height/2;			
			winfeatures = "width="+width+", height="+height+",menubar=no,toolbar=yes,addressbar=yes,resizable=yes,location=yes,titlebar=yes,status=yes,scrollbars=yes,left="+winX+",top="+winY+",screenX="+winX+",screenY="+winY;
		}else{
			winfeatures = "width="+defaultWinWidth+", height="+defaultWinHeight+",menubar=no,toolbar=yes,addressbar=yes,resizable=yes,location=yes,titlebar=yes,status=yes,scrollbars=yes,left="+winX+",top="+winY+",screenX="+winX+",screenY="+winY;
		}
		winname = "_blank";

        newwin = window.open(winurl,winname,winfeatures);

}