function switchTag(tag,content,k,classty)
{
    var aclass,bclass,i,n
    if (classty=="l0") { 
	    aclass = "l1";
		bclass = "l2";
		n = 12;
	 }
	if (classty=="box") { 
	    aclass = "aa1";
		bclass = "aa2";
		n = 4; 
   	 }
	if (classty=="d0") { 
	    aclass = "bb1";
		bclass = "bb2";
		n = 2; 
   	 }
	 if (classty=="tx") { 
	    aclass = "dd1";
		bclass = "dd2";
		n = 3; 
   	 }
	for(i=1; i <=n; i++)
	{
		if (i==k)
		{
			document.getElementById(tag+i).className=aclass;
			document.getElementById(content+i).className="box_show";
		}else{
			document.getElementById(tag+i).className=bclass;
			document.getElementById(content+i).className="box_none";
		}
	}
}