function supply()
{
  //alert(cover.supplier.options[cover.supplier.selectedIndex].text)
  if (cover.supplier.options[cover.supplier.selectedIndex].text == 'Southern Print')
  {
    cover.finish.disabled = false
    cover.print.disabled = false 
    cover.ifc.disabled = false
    cover.ibc.disabled = false
    cover.obc.disabled = false  
    
    cover.finish.style.background='#ffffff'
    cover.print.style.background='#ffffff'
    cover.ifc.style.background='#ffffff'
    cover.ibc.style.background='#ffffff'
    cover.obc.style.background='#ffffff'    			
  }
  
  if (cover.supplier.options[cover.supplier.selectedIndex].text == 'Customer')
  {
    cover.finish.style.background='#C0C0C0'
    cover.print.style.background='#C0C0C0'
    cover.ifc.style.background='#C0C0C0'
    cover.ibc.style.background='#C0C0C0'
    cover.obc.style.background='#C0C0C0'
       
    cover.finish.disabled = true
    cover.print.disabled = true
    cover.ifc.disabled = true
    cover.ibc.disabled = true
    cover.obc.disabled = true
  }
  
  if (cover.cover_type.options[cover.cover_type.selectedIndex].text == 'Self')
  {
    cover.ifc.style.background='#C0C0C0'
    cover.ibc.style.background='#C0C0C0'
    cover.obc.style.background='#C0C0C0'       
    cover.ifc.disabled = true
    cover.ibc.disabled = true
    cover.obc.disabled = true
  }  
  
  if (cover.cover_type.options[cover.cover_type.selectedIndex].text == 'None')
  {   
    cover.ifc.style.background='#C0C0C0'
    cover.ibc.style.background='#C0C0C0'
    cover.obc.style.background='#C0C0C0'
    cover.ifc.disabled = true
    cover.ibc.disabled = true
    cover.obc.disabled = true
  }
}