[tthurgo]

This is tough since it uses another function from dreamweaver (mm_findobj). So anyway, here is a piece of code that should work.

function show_hide_layer(the_layer){
  if(document.getElementById(the_layer).style.display == 'none'){
    document.getElementById(the_layer).style.display = 'inline';
  }else{
    document.getElementById(the_layer).style.display = 'none';
  }
}

Works for me in IE, Firefox, Safari and so on. Even Opera does it (I think! ).