function toggleAirtransatPlanes(obj){

count=0
while(document.getElementById("airtransat"+count)){
document.getElementById("airtransat"+count).style.display="none"
count++
}
document.getElementById("airtransat"+obj.selectedIndex).style.display="block"

}

function toggleThomasCookPlanes(obj){

count=0
while(document.getElementById("thomascook"+count)){
document.getElementById("thomascook"+count).style.display="none"
count++
}
document.getElementById("thomascook"+obj.selectedIndex).style.display="block"

}