function changeBlock(section_name) {

		var path					=	'/images/tabs/';
		
		
		var oDIVasia		=	document.getElementById('asia');
		var oDIVaustralia	=	document.getElementById('australia');
		var oDIVnewzealand	=	document.getElementById('newzealand');
		var oDIVpacific		=	document.getElementById('pacific');

		var img1_src				=	'asia.gif';
		var img2_src				=	'australia.gif';
		var img3_src				=	'newzealand.gif';
		var img4_src				=	'pacific.gif';

		var img1_over_src			=	'asia_over.gif';
		var img2_over_src			=	'australia_over.gif';
		var img3_over_src			=	'newzealand_over.gif';
		var img4_over_src			=	'pacific_over.gif';

		//IMAGE OBJECTS
		var oImg1					=	document.getElementById('image1');
		var oImg2					=	document.getElementById('image2');
		var oImg3					=	document.getElementById('image3');
		var oImg4					=	document.getElementById('image4');
		
		if (section_name == '1st') {
		
			oImg1.src				=	path+img1_over_src;
			oImg2.src				=	path+img2_src;
			oImg3.src				=	path+img3_src;
			oImg4.src				=	path+img4_src;
			
			oDIVasia.className		=	'show';
			oDIVaustralia.className	=	'hide';
			oDIVnewzealand.className=	'hide';
			oDIVpacific.className	=	'hide';
			
		} 
		
		if (section_name == '2nd') {
		

			oImg1.src				=	path+img1_src;
			oImg2.src				=	path+img2_over_src;
			oImg3.src				=	path+img3_src;
			oImg4.src				=	path+img4_src;

			oDIVasia.className		=	'hide';
			oDIVaustralia.className	=	'show';
			oDIVnewzealand.className=	'hide';
			oDIVpacific.className	=	'hide';
			
		}    
		
		if (section_name == '3rd') {
		

			oImg1.src				=	path+img1_src;
			oImg2.src				=	path+img2_src;
			oImg3.src				=	path+img3_over_src;
			oImg4.src				=	path+img4_src;

			oDIVasia.className		=	'hide';
			oDIVaustralia.className	=	'hide';	
			oDIVnewzealand.className=	'show';
			oDIVpacific.className	=	'hide';
			
		}  
		
		if (section_name == '4th') {
		

			oImg1.src				=	path+img1_src;
			oImg2.src				=	path+img2_src;
			oImg3.src				=	path+img3_src;
			oImg4.src				=	path+img4_over_src;

			oDIVasia.className		=	'hide';
			oDIVaustralia.className	=	'hide';	
			oDIVnewzealand.className=	'hide';	
			oDIVpacific.className	=	'show';
			
		}                 
		
	}