function north_america_show()
			{	
			
			document.getElementById('world').style.display="none";
			document.getElementById('north_america').style.display="block";		
		
			}
function north_america_hide()
			{	
			
			document.getElementById('world').style.display="block";
			document.getElementById('north_america').style.display="none";		
			
			}			
			
			
			
function south_america_show()
			{	
			
			document.getElementById('world').style.display="none";
			document.getElementById('south_america').style.display="block";						
				
		
			}
function south_america_hide()
			{	
			
			document.getElementById('world').style.display="block";
			document.getElementById('south_america').style.display="none";	
					
		
			}
			
			
			
function europe_show()
			{	
			
			document.getElementById('world').style.display="none";
			document.getElementById('europe').style.display="block";		
					
		
			}
function europe_hide()
			{	
			
			document.getElementById('world').style.display="block";
			document.getElementById('europe').style.display="none";			
				
			}			
			
			
function africa_show()
			{	
			
			document.getElementById('world').style.display="none";
			document.getElementById('africa').style.display="block";						
		
			}
function africa_hide()
			{	
			
			document.getElementById('world').style.display="block";
			document.getElementById('africa').style.display="none";			
			}
			
			
			
			
			
function asia_show()
			{	
			
			document.getElementById('world').style.display="none";
			document.getElementById('asia').style.display="block";				
		
			}
function asia_hide()
			{	
			
			document.getElementById('world').style.display="block";
			document.getElementById('asia').style.display="none";				
			}
			
			
function aus_show()
			{	
			
			
			document.getElementById('world').style.display="none";			
			document.getElementById('aus').style.display="block";					
		
			}
function aus_hide()
			{	
			
			document.getElementById('world').style.display="block";
			document.getElementById('aus').style.display="none";					
			}	
			
			
			
function ind_show()
			{	
			
			
			document.getElementById('world').style.display="none";			
			document.getElementById('ind').style.display="block";					
		
			}
function ind_hide()
			{	
			
			document.getElementById('world').style.display="block";
			document.getElementById('ind').style.display="none";					
			}