function Get(){
var Then = new Date() 
Then.setTime(Then.getTime() + 0 * 60 * 1000 ) //Γλ
var cookieString = new String(document.cookie)
var cookieHeader = "Cookie1=" 
var beginPosition = cookieString.indexOf(cookieHeader)
if (beginPosition != -1){ 
} 
else 
{ 
document.cookie = "Cookie1=POPWIN;expires="+ Then.toGMTString()  
window.open('pop_ad.asp','Announcement','width=300,height=400,top=5,left=5,scrollbars=yes,resizable=yes')
}
}
Get();