function ch_sub(target,menu,content,max, type)
{
	if(type==""){
		for(i=0;i<max;i++)
		{
			var temp_src = document.getElementById(menu+"_"+(i+1)).src;
			document.getElementById(menu+"_"+(i+1)).src = temp_src.replace(/_on/gi,"");
			temp_src="";
			document.getElementById(content+"_"+(i+1)).style.display="none";
		}
		var src = document.getElementById(menu+"_"+target).src;
		document.getElementById(menu+"_"+target).src = src.replace(/.png/gi,"_off.png");
		document.getElementById(content+"_"+target).style.display="block";
	}

	else if(type=="off")
	{
		for(i=0;i<max;i++)
		{
			var temp_src = document.getElementById(menu+"_"+(i+1)).src;
			document.getElementById(menu+"_"+(i+1)).src = temp_src.replace(/_on/gi,"_off");
			temp_src="";
			document.getElementById(content+"_"+(i+1)).style.display="none";
		}
		var src = document.getElementById(menu+"_"+target).src;
		document.getElementById(menu+"_"+target).src = src.replace(/_off.png/gi,"_off.png");
		document.getElementById(content+"_"+target).style.display="block";
	}
}