function MM_showHideLayers() { //v3.0
var i,p,v,obj,args=MM_showHideLayers.arguments;
for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
obj.visibility=v; }
}


function switch_Content(x){

objX = new Array;

for(i=0;i<4;i++){
	objX[i]=MM_findObj('manual'+i);
	objX[i]=objX[i].style;
	MM_showHideLayers('manual'+i,'','hide');
	objX[i].display="none";
}

MM_showHideLayers('manual'+x,'','show');
objX[x].display="block";

}