function changeBlock3(section_name) {

		var path					=	'/images/tabs/';
		
		
		var oDIVoverview			=	document.getElementById('overview');
		var oDIVvideo				=	document.getElementById('video');

		var img8_src				=	'overview.gif';
		var img10_src				=	'video.gif';

		var img8_over_src			=	'overview_over.gif';
		var img10_over_src			=	'video_over.gif';

		//IMAGE OBJECTS
		var oImg8					=	document.getElementById('image8');
		var oImg10					=	document.getElementById('image10');
		
		if (section_name == '8th') {
		
			oImg8.src				=	path+img8_over_src;
			oImg10.src				=	path+img10_src;
			
			oDIVoverview.className	=	'show';
			oDIVvideo.className		=	'hide';
			
		} 
		
	   
		
		if (section_name == '10th') {
		

			oImg8.src				=	path+img8_src;
			oImg10.src				=	path+img10_over_src;

			oDIVoverview.className	=	'hide';
			oDIVvideo.className		=	'show';
			
		}              
		
	}