function changeclass() { 

var NAME = document.getElementById("n1");

if ( NAME.className == 'current' )
	 NAME.className = 'none';
else
     NAME.className = 'current';

var NAME2 = document.getElementById("n2");

NAME2.className="none";

var NAME3 = document.getElementById("n3");

NAME3.className="none";

var NAME4 = document.getElementById("n4");

NAME4.className="none";

var NAME5 = document.getElementById("n5");

NAME5.className="none";

var NAME6 = document.getElementById("n6");

NAME6.className="none";

} 

function changeclass2() { 

var NAME = document.getElementById("n1") 

NAME.className="none" 

var NAME2 = document.getElementById("n2") 

NAME2.className="current"

var NAME3 = document.getElementById("n3") 

NAME3.className="none" 

var NAME4 = document.getElementById("n4") 

NAME4.className="none" 

var NAME5 = document.getElementById("n5") 

NAME5.className="none" 

var NAME6 = document.getElementById("n6") 

NAME6.className="none" 

}

function changeclass3() { 

var NAME = document.getElementById("n1") 

NAME.className="none" 

var NAME2 = document.getElementById("n2") 

NAME2.className="none"

var NAME3 = document.getElementById("n3") 

NAME3.className="current" 

var NAME4 = document.getElementById("n4") 

NAME4.className="none" 

var NAME5 = document.getElementById("n5") 

NAME5.className="none" 

var NAME6 = document.getElementById("n6") 

NAME6.className="none" 

}

function changeclass4() { 

var NAME = document.getElementById("n1") 

NAME.className="none" 

var NAME2 = document.getElementById("n2") 

NAME2.className="none"

var NAME3 = document.getElementById("n3") 

NAME3.className="none" 

var NAME4 = document.getElementById("n4") 

NAME4.className="current" 

var NAME5 = document.getElementById("n5") 

NAME5.className="none" 

var NAME6 = document.getElementById("n6") 

NAME6.className="none" 

}

function changeclass5() { 

var NAME = document.getElementById("n1") 

NAME.className="none" 

var NAME2 = document.getElementById("n2") 

NAME2.className="none"

var NAME3 = document.getElementById("n3") 

NAME3.className="none" 

var NAME4 = document.getElementById("n4") 

NAME4.className="none" 

var NAME5 = document.getElementById("n5") 

NAME5.className="current" 

var NAME6 = document.getElementById("n6") 

NAME6.className="none" 

}

function changeclass6() { 

var NAME = document.getElementById("n1") 

NAME.className="none" 

var NAME2 = document.getElementById("n2") 

NAME2.className="none"

var NAME3 = document.getElementById("n3") 

NAME3.className="none" 

var NAME4 = document.getElementById("n4") 

NAME4.className="none" 

var NAME5 = document.getElementById("n5") 

NAME5.className="none" 

var NAME6 = document.getElementById("n6") 

NAME6.className="current" 

}