function displayMain(position){
  //Internet Explorer
  if(navigator.appName.charAt(0)=="M"){
  	if (navigator.appVersion.indexOf("MSIE 5") != -1 || navigator.appVersion.indexOf("MSIE 6") != -1){
      if(document.getElementById){
				if (document.getElementById("layMain"+position).style.display=="none"){
					//document.getElementById("layMain"+position).style.visibility="visible";
					document.getElementById("layMain"+position).style.display="block";
				}else{
					//document.getElementById("layMain"+position).style.visibility="hidden";
					document.getElementById("layMain"+position).style.display="none";
				}
			}
    }else{
      if(document.all){
				if (document.all("layMain"+position).style.display=="none"){
					//document.all("layMain"+position).style.visibility="visible";
					document.all("layMain"+position).style.display="block";
				}else{
					//document.all("layMain"+position).style.visibility="hidden";
					document.all("layMain"+position).style.display="none";
				}
			}
    }
  }
  //Netscape
  if(navigator.appName.charAt(0)=="N"){
    if(document.getElementById){
			if (document.getElementById("layMain"+position).style.display=="none"){
				//document.getElementById("layMain"+position).style.visibility="visible";
				document.getElementById("layMain"+position).style.display="block";
			}else{
				//document.getElementById("layMain"+position).style.visibility="hidden";
				document.getElementById("layMain"+position).style.display="none";
			}
		}
		if(document.layers){
			if (document.layers["layMain"+position].display=="none"){
				//document.layers["layMain"+position].visibility="show";
				document.layers["layMain"+position].display="block";
			}else{
				//document.layers["layMain"+position].visibility="hide";
				document.layers["layMain"+position].display="none";
			}
		}
  }
//
}