var tab_first = 'menu_home'; 
var tab_last = 'menu_site_map'; 

function current_menu()
{
if (tab_current == tab_first){
   document.getElementById(tab_current).style.background = 'url(images/navigation/top_menu/left_tab.gif)';
   }
if (tab_current == tab_last){
   document.getElementById(tab_current).style.background = 'url(images/navigation/top_menu/right_tab.gif)';
   document.getElementById(tab_current).style.backgroundPosition = 'right top';
   }
if (tab_current != tab_first && tab_current != tab_last){	
   document.getElementById(tab_current).style.background = 'url(images/navigation/top_menu/tab.gif)';
   }   
}

var hidingdiv;
var showingdiv;

function hidediv(hidingdiv)
{
var obj = document.getElementById(hidingdiv);obj.style.display='none';}

function showdiv(showingdiv)
{
var obj = document.getElementById(showingdiv);obj.style.display='inline';
}

function heading_1()
{
document.getElementById('find_out_more_heading_1').style.background = 'url(images/navigation/what_we_do/left_tab.gif)';
document.getElementById('find_out_more_heading_2').style.background = 'url(images/navigation/what_we_do/centre_tab_light.gif)';
document.getElementById('find_out_more_heading_3').style.background = 'url(images/navigation/what_we_do/right_tab_light.gif)';
document.getElementById('find_out_more_heading_3').style.backgroundPosition = 'right top';
}

function heading_2()
{
document.getElementById('find_out_more_heading_1').style.background = 'url(images/navigation/what_we_do/left_tab_light.gif)';
document.getElementById('find_out_more_heading_2').style.background = 'url(images/navigation/what_we_do/centre_tab.gif)';
document.getElementById('find_out_more_heading_3').style.background = 'url(images/navigation/what_we_do/right_tab_light.gif)';
document.getElementById('find_out_more_heading_3').style.backgroundPosition = 'right top';
}

function heading_3()
{
document.getElementById('find_out_more_heading_1').style.background = 'url(images/navigation/what_we_do/left_tab_light.gif)';
document.getElementById('find_out_more_heading_2').style.background = 'url(images/navigation/what_we_do/centre_tab_light.gif)';
document.getElementById('find_out_more_heading_3').style.background = 'url(images/navigation/what_we_do/right_tab.gif)';
document.getElementById('find_out_more_heading_3').style.backgroundPosition = 'right top';
}