function tauscheBild(bildName,dateiName)
         {
          document.images[bildName].src=dateiName;
       }


function SetzeLeft(LayerName,neuesLeft)
         {
			 //alert("SetzeLeft(LayerName, neuesLeft)" + LayerName + " " + neuesLeft);
         if (document.all)
            {
            document.all(LayerName).style.left=neuesLeft;
            }
         else if(document.layers)
              {
              document.layers[LayerName].left=neuesLeft;
              }
         else if(document.getElementById)
              {
              document.getElementById(LayerName).style.left=neuesLeft;
               }
         }
		 
		 function SetzeTop(LayerName,neuesTop)
         {
         if (document.all)
            {
            document.all(LayerName).style.top=neuesTop;
            }
         else if(document.layers)
              {
              document.layers[LayerName].top=neuesTop;
              }
         else if(document.getElementById)
              {
              document.getElementById(LayerName).style.top=neuesTop;
               }
         }
		 
         var position=600; //globale Variable
		 
function moveLayer()
         {
         if (position>-30)
         {
         position=position-3;
         SetzeLeft('tierLayer',position);
        SetzeTop('tierLayer',position);
		setTimeout("moveLayer()",50);
		   
                   }
                   }
				
function resizeImage(bildname, bildquelle){ 
if (screen.width==800){ 
  document.getElementById(bildname).src=bildquelle; 
  document.getElementById(bildname).width="500"; 
  document.getElementById(bildname).height="300"; 
} 
}