function showdiv_4(divnum,divbefor){
       document.getElementById("Nav4_1").className = "CouMenu";
	   document.getElementById("Nav4_2").className = "CouKey";
	   if(divbefor == 1){
	   document.getElementById("Nav4_1").className = "CouKey";
	   document.getElementById("Nav4_2").className = "CouMenu";
		   }
	   if(divbefor == 2){
	   document.getElementById("Nav4_1").className = "CouMenu";
	   document.getElementById("Nav4_2").className = "CouKey";
		   }

	for(i=1;i<=divnum;i++){
				if(i==divbefor){
						document.getElementById("Content4_"+i).className ="block";
						document.getElementById("tq_"+i).className ="eofw";
				}else{
						document.getElementById("Content4_"+i).className ="none";
						document.getElementById("tq_"+i).className ="olfw";
				}
        }	   
}



function showdiv_2(divnum,divbefor){
       document.getElementById("Nav2_1").className = "CouMenu";
	   document.getElementById("Nav2_2").className = "CouKey";
	   if(divbefor == 1){
		     document.getElementById("Nav2_1").className = "CouKey";
	   document.getElementById("Nav2_2").className = "CouMenu";
		   }

	for(i=1;i<=divnum;i++){
				if(i==divbefor){
						document.getElementById("Content2_"+i).className ="block";
						document.getElementById("ty_"+i).className ="eofw";
				}else{
						document.getElementById("Content2_"+i).className ="none";
						document.getElementById("ty_"+i).className ="olfw";
				}
        }	   
}