if (document.all) {
layerview='document.all'
styleview='.style.'
}
else if (document.all) {
layerview='document.all'
styleview='.'
} 

function show(){
eval(layerview+'["all"]'+styleview+'visibility="visible"') 
}
function hide(){
eval(layerview+'["all"]'+styleview+'visibility="hidden"') 
}