function bildertausch(feldnr) {
         	feldnr_2=feldnr;
           	if (document.images) {
				var bildname= document.images["kapitel"+feldnr].src;
   				if (bildname.lastIndexOf("c.gif") == -1) {
                	document.images["kapitel"+feldnr].src=green[feldnr].src;
              	}//end if
           	}//end if
        }//end fn

 		function bildertausch2(feldnr) {
         	feldnr_2=feldnr;
           	if (document.images) {
				var bildname= document.images["kapitel"+feldnr].src;
   				if (bildname.lastIndexOf("c.gif") == -1) {
                	document.images["kapitel"+feldnr].src=blue[feldnr].src;
                }//end if
          	}//end if
        }//end fn


		/* preload */
		function MM_preloadImages() { 
			 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
  			 var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
  			 if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
		}