function overMM(){
				document.mediamix.src ="img/BUT_mediamix_over.gif";
				}
			function outMM(){ 
				document.mediamix.src ="img/BUT_mediamix.gif";
				}
				
			function overF4U(){
				document.fun4u.src ="img/BUT_fun4u_over.gif";
				}
			function outF4U(){ 
				document.fun4u.src ="img/BUT_fun4u.gif";
				}