function popWin(url){
var Width = 500
var Height = 300
var posX = (screen.availWidth - Width) / 2
var posY = (screen.availHeight - Height) / 2

var popUp = window.open(url,'pop','width='+Width+',height='+Height+',left='+posX+',top='+posY+',scrollbars=yes,resizable=yes') 
popUp.focus()
}