function popUp(popUpURL, popUpName, popUpWidth, popUpHeight) {
      var popUpParamString = "";     
  if(popUpName == "fix"){//feste gr?sse, keine scrollbars
           if(popUpHeight == ""){
                    popUpHeight = 180;
                }              
          if(popUpWidth == ""){
                     popUpWidth = 200;
         }
         popUpParamString = "menubar=0,location=0,toolbar=0,status=0,resizable=0,scrollbars=yes,dependent=1,height=" + popUpHeight +",width=" + popUpWidth;
        }      
  else if(popUpName == "flax"){//keine feste gr?sse, keine scrollbars positon mitte
         var wstat
         var ns4up = (document.layers) ? 1 : 0
             var ie4up = (document.all) ? 1 : 0
                var xsize = screen.width
          var ysize = screen.height
         var breite=popUpWidth
             var hoehe=popUpHeight
             var xpos=(xsize-breite)/2
         var ypos=(ysize-hoehe)/2
            if(popUpHeight == ""){
                    popUpHeight = 180;
                }              
          if(popUpWidth == ""){
                     popUpWidth = 200;
         }
         popUpParamString = "menubar=0,location=0,toolbar=0,status=0,resizable=0,scrollbars=yes,dependent=1,height=" + popUpHeight +",width=" + popUpWidth +",top="+ypos+",left="+xpos;
    }      
         
  else if(popUpName == "flex"){//keine feste gr?sse, mit scrollbars
         if(popUpHeight == ""){
                    popUpHeight = 600;
                }              
          if(popUpWidth == ""){
                     popUpWidth = 400;
         }
         popUpParamString = "menubar=1,location=0,toolbar=0,status=1,resizable=1,dependent=1,scrollbars=yes,height=" + popUpHeight +",width=" + popUpWidth;
        }              
         
  else if(popUpName == "flux"){//feste gr?sse, mit scrollbars
              
          if(popUpHeight == ""){
                    popUpHeight = 600;
                }
        
          if(popUpWidth == ""){
                     popUpWidth = 400;
         }
         popUpParamString = "menubar=0,location=0,toolbar=0,status=0,resizable=0,dependent=1,scrollbars=yes,height=" + popUpHeight +",width=" + popUpWidth;
        }      
 
  else if(popUpName == "media"){//keine feste gr?sse, mit scrollbars
                if(popUpHeight == ""){
                    popUpHeight = 600;
                }              
          if(popUpWidth == ""){
                     popUpWidth = 400;
         }
         popUpParamString = "menubar=1,location=0,toolbar=1,status=1,resizable=1,dependent=1,scrollbars=yes,height=" + popUpHeight +",width=" + popUpWidth;
        }
 else if(popUpName == "agb"){//keine feste gr?sse, mit scrollbars
          if(popUpHeight == ""){
                    popUpHeight = 600;
                }              
          if(popUpWidth == ""){
                     popUpWidth = 700;
         }
         popUpParamString = "menubar=0,location=0,toolbar=1,status=0,resizable=1,dependent=1,scrollbars=yes,height=" + popUpHeight +",width=" + popUpWidth;
        }      
  window.open(popUpURL,popUpName,popUpParamString);
}