function displayDiv( value, id  ){
  if ( isDOM )
    document.getElementById( id ).style.display=value
  else if ( isDomIE )  
    document.all[ id ].style.display=value;
  else if ( isDomNN  )  
    document.layers[ id ].display=value;
}
  
function hideLayer(layName,lay2Name){
  if ( isDOM )
    document.getElementById(layName).style.visibility="hidden"
  else if ( isDomIE )  
    document.all[layName].style.visibility="hidden";
  else if ( isDomNN && !lay2Name )  
    document.layers[layName].visibility="hidden";
  else if ( isDomNN && lay2Name )  
    document.layers[lay2Name].document.layers[layName].visibility="hidden";
}

function showLayer(layName,lay2Name){
  if ( isDOM )
    document.getElementById(layName).style.visibility="visible"
  else if ( isDomIE )  
    document.all[layName].style.visibility="visible";
  else if ( isDomNN && !lay2Name )  
    document.layers[layName].visibility="visible";
  else if  ( isDomNN && lay2Name )   
    document.layers[lay2Name].document.layers[layName].visibility="visible";
}
  
function hideLayer(layName,lay2Name){
  if ( isDOM )
    document.getElementById(layName).style.visibility="hidden"
  else if ( isDomIE )  
    document.all[layName].style.visibility="hidden";
  else if ( isDomNN && !lay2Name )  
    document.layers[layName].visibility="hidden";
  else if ( isDomNN && lay2Name )  
    document.layers[lay2Name].document.layers[layName].visibility="hidden";
}

function setyLayer(y,layName,lay2Name) {
  if (isDOM)
    document.getElementById(layName).style.top=y
  else if ( isDomIE )
    document.all[layName].style.top=y;
  else if ( isDomNN && !lay2Name )  
    document.layers[layName].top=y;
  else if ( isDomNN && lay2Name )  
    document.layers[lay2Name].document.layers[layName].top=y;
}

function setxLayer(x,layName,lay2Name) {
  if (isDOM)
    document.getElementById(layName).style.left=x
  else if ( isDomIE )
    document.all[layName].style.left=x;
  else if ( isDomNN && !lay2Name )  
    document.layers[layName].left=x;
  else if ( isDomNN && lay2Name )  
    document.layers[lay2Name].document.layers[layName].top=y;
}

function getLayerHeight(layName) {
  if (isDOM)
    return document.getElementById(layName).offsetHeight
  else if ( isDomIE )
    return document.all[layName].offsetHeight;
  else  
    return 0;
}