function init(){
	
	document.getElementById("btEmpresa").onmouseover = function(){document.getElementById("sub_empresa").style.display = 'block';}; 
	document.getElementById("btEmpresa").onmouseout = function(){document.getElementById("sub_empresa").style.display = 'none';}; 
	document.getElementById("sub_empresa").onmouseout = function(){document.getElementById("sub_empresa").style.display = 'none';}; 
	document.getElementById("sub_empresa").onmouseover = function(){document.getElementById("sub_empresa").style.display = 'block';};
	
}

window.onload=init