function viewGnbsub(layerId)
{
	var sublayer_length = getCountElementsByIdName();
	var divId = "submenu_";

	for(var i=1;i<=sublayer_length;i++)
	{
		if(layerId==divId+i)
		{
			document.getElementById(divId+i).style.display = "block";
		}
		else
		{
			document.getElementById(divId+i).style.display = "none";
		}
	}
}

function hideGnbsub()
{
	var sublayer_length = getCountElementsByIdName();
	var divId = "submenu_";
	for(var i=1;i<=sublayer_length;i++)
	{
		document.getElementById(divId+i).style.display = "none";
	}
}


function getCountElementsByIdName(){
	  var arrReturn = new Array();
	  arrAll = document.getElementsByTagName("div");

	  for(var i=0; i<arrAll.length; i++){
	  	if(arrAll[i].id.search(/^submenu_.+/) != -1){
	    	arrReturn[arrReturn.length] = arrAll[i];
	    }
	  }

	  return arrReturn.length;
	}