// following is for a screen-centered popup

function popupWindow(openPic,openWidth,openHeight,target)
{
    var iMyWidth;
  
    var iMyHeight; //gets top and left positions based on user's resolution so  window is centered.
 
   iMyWidth = (window.screen.width/2) - ((openWidth/2) + 10); //half the screen width minus half the new window width (plus 5 pixel borders).
        
   iMyHeight = (window.screen.height/2) - ((openHeight/2) ); //half the screen height minus half the new window height (plus title and status bars).
   
   //alert(target);
   //target = extern: externe wqebseiten werde in ein popunder geladen  
   if(target == 'extern') {
   var openURL ='..\/..\/popup_external_sites.html'+ '?'+ openPic;
   var win2 = window.open(openURL,"Window2","height="+openHeight+",width="+openWidth+",scrollbars=yes,status=yes,toolbar=yes,location=yes,resizable=yes,left=0,top=0,screenX=0,screenY=0'");
   }
   // target = intern_html: interne html-seiten (flash etc) werden in ein popup geladen
   else if (target == "intern_html") var openURL =openPic;
   // alles andere: grafiken werden in ein popupe geladen
   else var openURL = '..\/..\/popup.html'+ '?'+ openPic;
   

var win2 = window.open(openURL,"Window2","height="+openHeight+",width="+openWidth+",resizable=no,left=" + iMyWidth + ",top=" + iMyHeight + ",screenX=" + iMyWidth + ",screenY=" + iMyHeight + ",scrollbars=no");
	

  
  }