function cu(stat){
	if (stat == 1){ 
		document.all.cu1.style.display = "block"; 
		document.all.cu2.style.display = "none"; 
		document.all.cu3.style.display = "none"; 
		document.all.cu4.style.display = "none"; 
		document.all.cu5.style.display = "none";

	} else if (stat == 2){  
		document.all.cu1.style.display = "none"; 
		document.all.cu2.style.display = "block"; 
		document.all.cu3.style.display = "none";
		document.all.cu4.style.display = "none";
		document.all.cu5.style.display = "none";

	} else if (stat == 3){  
		document.all.cu1.style.display = "none"; 
		document.all.cu2.style.display = "none"; 
		document.all.cu3.style.display = "block";
		document.all.cu4.style.display = "none"; 
		document.all.cu5.style.display = "none";
 
    } else if (stat == 4){  
		document.all.cu1.style.display = "none"; 
		document.all.cu2.style.display = "none"; 
		document.all.cu3.style.display = "none"; 
		document.all.cu4.style.display = "block";
		document.all.cu5.style.display = "none"; 

   } else if (stat == 5){  
		document.all.cu1.style.display = "none"; 
		document.all.cu2.style.display = "none"; 
		document.all.cu3.style.display = "none"; 
		document.all.cu4.style.display = "none"; 
		document.all.cu5.style.display = "block";
	} 
}