function mOvr(src,clrOver) {
     obj= src.offsetParent;
 	 src.className = "textsubmenuover";
	 obj.className=clrOver;
}
 function mOut(src,clrIn,parentid) {
     obj= src.offsetParent;
	 src.className ="textsubmenu" ;
	 obj.className=clrIn;
 }
function findPosX(obj)
{
	var curleft = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curleft += obj.offsetLeft
			obj = obj.offsetParent;
		}
	}
	else if (obj.x)
		curleft += obj.x;
	return curleft;
}

function findPosY(obj)
{
	var curtop = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curtop += obj.offsetTop
			obj = obj.offsetParent;
		}
	}
	else if (obj.y)
		curtop += obj.y;
	return curtop;
}

function _showmenu(id,parentid)
{	  
	var wy =findPosY(document.getElementById(parentid));
	var wx =findPosX(document.getElementById(parentid));
	var wh = document.getElementById(parentid).offsetHeight;
	document.getElementById(id).style.top=wy+wh;
	document.getElementById(id).style.left=wx;
	
	if (document.getElementById) 
          {		  
           document.getElementById(id).style.visibility="visible";		
          } 
          else 
          if (document.all) 
          {		  
          document.all[id].style.visibility="visible";		
          } 
          else 
          if (document.layers) 
          {		  
          document.layers[id].visibility="visible";		
          } 
}
function _hidemenu(id)
{	  
		
		if (document.getElementById) 
          {		  
          document.getElementById(id).style.visibility="hidden";		
          } 
          else 
          if (document.all) 
          {		  
          document.all[id].style.visibility="hidden";		
          } 
          else 
          if (document.layers) 
          {		  
          document.layers[id].visibility="hidden";		
          } 
}

function setCentral()
{
var w_hBody = parseInt(document.body.clientHeight);
var w_hHeader = document.getElementById("r_cabecera").offsetHeight;
var w_hContent = document.getElementById("r_central").offsetHeight; 
var w_hFooter = document.getElementById("r_pie").offsetHeight;
var w_espacioLibre = w_hBody - w_hHeader - w_hFooter;

if(w_espacioLibre > w_hContent)
{
	document.getElementById("r_central").style.height = w_espacioLibre;
}
else
{
  document.getElementById("r_central").style.height = w_hContent;
}
}

addLoadEvent(setCentral);