//bottom images
function change(desc)

	{		var obj;
			obj = window.document.getElementById(desc); 
			obj.src = "gui/bottom/"+desc+"_over.jpg";					
	}
	
function changeback(desc)

	{
			var obj;
			obj = window.document.getElementById(desc); 
			obj.src = "gui/bottom/"+desc+".jpg";					
	}


//top menu
function change2(desc)

	{		var obj;
			obj = window.document.getElementById(desc); 
			obj.src = "gui/menu/menu_titles/"+desc+"_over.jpg";					
	}
	
function changeback2(desc)

	{
			var obj;
			obj = window.document.getElementById(desc); 
			obj.src = "gui/menu/menu_titles/"+desc+".jpg";					
	}



function change3()

	{		
			var obj;
			obj = window.document.getElementById('bottom_left_courses'); 
			obj.style.background = "url(gui/bottom/courses_left_over.jpg)";				
	}
	
function changeback3()

	{
			var obj;
			obj = window.document.getElementById('bottom_left_courses'); 
			obj.style.background = "url(gui/bottom/courses_left.jpg)";				
	}
	
function change4()

	{		
			var obj;
			obj = window.document.getElementById('bottom_right_courses'); 
			obj.style.background = "url(gui/bottom/courses_right_over.jpg)";				
	}
	
function changeback4()

	{
			var obj;
			obj = window.document.getElementById('bottom_right_courses'); 
			obj.style.background = "url(gui/bottom/courses_right.jpg)";				
	}

function change5()

	{		
			var obj;
			obj = window.document.getElementById('bottom_centre_courses'); 
			obj.style.background = "url(gui/bottom/courses_middle_over.jpg)";				
	}
	
function changeback5()

	{
			var obj;
			obj = window.document.getElementById('bottom_centre_courses'); 
			obj.style.background = "url(gui/bottom/courses_middle.jpg)";				
	}