var selectedButton;
		
		function selectButton(btn)
		{
			if(btn.style.backgroundImage.indexOf('bg_sel') == -1)
			{
				if(selectedButton != null)
				{
					changeButton(selectedButton, false);
				}

				changeButton(btn, true);
			}
			parent.frames.content.location.href = 'page.php?id=' + btn.id;
			
			selectedButton = btn;
		}
		
		function changeButton(btn, selected)
		{
			if(selected)
				sel = '_sel';
			else
				sel = '';
				
			btn.style.backgroundImage = 'url(\'img/menu/btn_bg' + sel + '.gif\')';
			if(navigator.appName.indexOf('Microsoft') > -1)
				divA = btn.previousSibling.firstChild;
			else
				divA = btn.previousSibling.previousSibling.firstChild;
			if(divA.src.indexOf('only') != -1)
				divA.src = 'img/menu/div_rightonly' + sel + '.png';
			else if(selected)
				divA.src = 'img/menu/div_right' + sel + '.png';
			else
				divA.src = 'img/menu/div_nosel.png';
			
			if(navigator.appName.indexOf('Microsoft') > -1)
                                divB = btn.nextSibling.firstChild;
                        else
                                divB = btn.nextSibling.nextSibling.firstChild;

			if(divB.src.indexOf('only') != -1)
				divB.src = 'img/menu/div_leftonly' + sel + '.png';
			else if(selected)
				divB.src = 'img/menu/div_left' + sel + '.png';
			else
				divB.src = 'img/menu/div_nosel.png';
		}