function ist_button() 
 {
    document.images["ist"].src = "area_ist01b.gif"
  } 
function ist2_button()
 {
    document.images["ist"].src = "area_ist01.gif"
  }
    
function ist3_button() 
 {
    document.images["ist2"].src = "area_ist02b.gif"
  } 
function ist4_button()
 {
    document.images["ist2"].src = "area_ist02.gif"
  }
    
function ist5_button() 
 {
    document.images["ist3"].src = "area_ist03b.gif"
  } 
function ist6_button()
 {
    document.images["ist3"].src = "area_ist03.gif"
  }
  
function ist7_button() 
 {
    document.images["ist4"].src = "area_ist04b.gif"
  } 
function ist8_button()
 {
    document.images["ist4"].src = "area_ist04.gif"
  }
    
function ist9_button() 
 {
    document.images["ist5"].src = "area_ist05b.gif"
  } 
function ist10_button()
 {
    document.images["ist5"].src = "area_ist05.gif"
  }
    
function ist11_button() 
 {
    document.images["ist6"].src = "area_ist06b.gif"
  } 
function ist12_button()
 {
    document.images["ist6"].src = "area_ist06.gif"
  }
  
  
    
function prod_button() 
 {
    document.images["prod"].src = "area_prod01b.gif"
  } 
function prod2_button()
 {
    document.images["prod"].src = "area_prod01.gif"
  }
    
function prod3_button() 
 {
    document.images["prod2"].src = "area_prod02b.gif"
  } 
    
function prod4_button() 
 {
    document.images["prod2"].src = "area_prod02.gif"
  } 
function prod5_button()
 {
    document.images["prod3"].src = "area_prod03b.gif"
  }
function prod6_button() 
 {
    document.images["prod3"].src = "area_prod03.gif"
  } 
function prod7_button()
 {
    document.images["prod4"].src = "area_prod04b.gif"
  }
    
function prod8_button() 
 {
    document.images["prod4"].src = "area_prod04.gif"
  } 
    
function prod9_button() 
 {
    document.images["prod5"].src = "area_prod05b.gif"
  } 
function prod10_button()
 {
    document.images["prod5"].src = "area_prod05.gif"
  }
  
  
       
function ser_button() 
 {
    document.images["ser"].src = "area_ser01b.gif"
  } 
function ser2_button()
 {
    document.images["ser"].src = "area_ser01.gif"
  }
    
function ser3_button() 
 {
    document.images["ser2"].src = "area_ser02b.gif"
  } 
function ser4_button()
 {
    document.images["ser2"].src = "area_ser02.gif"
  }
    
function ser5_button() 
 {
    document.images["ser3"].src = "area_ser03b.gif"
  } 
function ser6_button()
 {
    document.images["ser3"].src = "area_ser03.gif"
  }
function ser7_button() 
 {
    document.images["ser4"].src = "area_ser04b.gif"
  } 
function ser8_button()
 {
    document.images["ser4"].src = "area_ser04.gif"
  }
    
function ser9_button() 
 {
    document.images["ser5"].src = "area_ser05b.gif"
  } 
function ser10_button()
 {
    document.images["ser5"].src = "area_ser05.gif"
  }
    
function ser11_button() 
 {
    document.images["ser6"].src = "area_ser06b.gif"
  } 
function ser12_button()
 {
    document.images["ser6"].src = "area_ser06.gif"
  }
  
    
    
    
function prodotti_button() 
 {
    document.images["prodotti"].src = "prodotti01b.gif"
  } 
function prodotti2_button()
 {
    document.images["prodotti"].src = "prodotti01.gif"
  }
    
function prodotti3_button() 
 {
    document.images["prodotti2"].src = "prodotti02b.gif"
  } 
    
function prodotti4_button() 
 {
    document.images["prodotti2"].src = "prodotti02.gif"
  } 
function prodotti5_button()
 {
    document.images["prodotti3"].src = "prodotti03b.gif"
  }
function prodotti6_button() 
 {
    document.images["prodotti3"].src = "prodotti03.gif"
  } 
function prodotti7_button()
 {
    document.images["prodotti4"].src = "prodotti04b.gif"
  }
    
function prodotti8_button() 
 {
    document.images["prodotti4"].src = "prodotti04.gif"
  } 
    
function prodotti9_button() 
 {
    document.images["prodotti5"].src = "prodotti05b.gif"
  } 
function prodotti10_button()
 {
    document.images["prodotti5"].src = "prodotti05.gif"
  }
  
  
  
    
function sup_button() 
 {
    document.images["sup"].src = "area_sup01b.gif"
  } 
function sup2_button()
 {
    document.images["sup"].src = "area_sup01.gif"
  }
    
function sup3_button() 
 {
    document.images["sup2"].src = "area_sup02b.gif"
  } 
    
function sup4_button() 
 {
    document.images["sup2"].src = "area_sup02.gif"
  } 
function sup5_button() 
 {
    document.images["sup3"].src = "area_sup03b.gif"
  } 
function sup6_button()
 {
    document.images["sup3"].src = "area_sup03.gif"
  }
    
function sup7_button() 
 {
    document.images["sup4"].src = "area_sup04b.gif"
  } 
    
function sup8_button() 
 {
    document.images["sup4"].src = "area_sup04.gif"
  }
// -->