function changeHeader(headType){
	var appearID, fade1, fade2, fade3, ophigh, oplow1, oplow2, oplow3;
	var appearIDopFrom, fade1opFrom, fade2opFrom, fade3opFrom, ophighopFrom, oplow1opFrom, oplow2opFrom, oplow3opFrom;
	switch (headType) {
  		case "MVBlog":
  			appearID= "#navigation_back_mac";
			fade1	= "#navigation_back_ubuntu";
			fade2	= "#navigation_back_ps3";
			fade3	= "#navigation_back_da";
			ophigh	= "#navigation_mac";
			oplow1	= "#navigation_ps3";
			oplow2	= "#navigation_ubuntu";
			oplow3	= "#navigation_da";
			break;
  		case "MVUbuntu":
  			appearID= "#navigation_back_ubuntu";
			fade1	= "#navigation_back_mac";
			fade2	= "#navigation_back_ps3";			
			fade3	= "#navigation_back_da";
			ophigh	= "#navigation_ubuntu";
			oplow1	= "#navigation_ps3";
			oplow2	= "#navigation_mac";
			oplow3	= "#navigation_da";
			break;
  		case "MVPS3":
			appearID= "#navigation_back_ps3";
			fade1	= "#navigation_back_ubuntu";
			fade2	= "#navigation_back_mac";
			fade3	= "#navigation_back_da";			
			ophigh	= "#navigation_ps3";
			oplow1	= "#navigation_mac";
			oplow2	= "#navigation_ubuntu";
			oplow3	= "#navigation_da";
		    break;
  		case "MVDA":
			appearID= "#navigation_back_da";
			fade1	= "#navigation_back_ubuntu";
			fade2	= "#navigation_back_mac";
			fade3	= "#navigation_back_ps3";			
			ophigh	= "#navigation_da";
			oplow1	= "#navigation_mac";
			oplow2	= "#navigation_ubuntu";
			oplow3	= "#navigation_ps3";
		    break;
	}

	jQuery(appearID).animate( { opacity:"1.0" }, { queue:false, duration:1000 });
	jQuery(fade1).animate( { opacity:"0" }, { queue:false, duration:1000 });
	jQuery(fade2).animate( { opacity:"0" }, { queue:false, duration:1000 });
	jQuery(fade3).animate( { opacity:"0" }, { queue:false, duration:1000 });

	jQuery(ophigh).animate( { opacity:"1.0" }, { queue:false, duration:500 });
	jQuery(oplow1).animate( { opacity:"0.2" }, { queue:false, duration:500 });
	jQuery(oplow2).animate( { opacity:"0.2" }, { queue:false, duration:500 });
	jQuery(oplow3).animate( { opacity:"0.2" }, { queue:false, duration:500 });	
}