function showmap(){
document.all.maptable.style.display="" 
document.all.maptable.style.visibility="visible"   
}
function hidemap(){
document.all.maptable.style.display="none" 
document.all.maptable.style.visibility="hidden"   
}  
function logoshow(){
document.all.logoimg.style.display="" 
document.all.logoimg.style.visibility="visible"   
}
function logohide(){
document.all.logoimg.style.display="none" 
document.all.logoimg.style.visibility="hidden"   
}