var browser, version;
var disable = 1;
var toc = new Array();
browser = navigator.appName;
version = parseInt(navigator.appVersion);
if (browser == "Netscape" && version >= 3) disable = 0;
if (browser == "Microsoft Internet Explorer" && version >= 4) disable = 0;
if (document.images == null) disable = 1;

function item(off, over)
{
if (disable) return;
this.off = new Image(); this.off.src = off;
this.over = new Image(); this.over.src = over;
}

function cache(id, off, over)
{
if (disable) return;
item[id] = new item(off, over);
toc[toc.length] = id;
}

function over(id)
{
if (disable) return;
document[id].src = item[id].over.src;
}

function out(id)
{
if (disable) return;
document[id].src = item[id].off.src;
}
	cache('novedades',"images/izq.gif","images/izq1.gif");
	 cache('biblioteca',"images/izq.gif","images/izq1.gif");
	 cache('control',"images/izq.gif","images/izq1.gif");
	  cache('politica',"images/izq.gif","images/izq1.gif");
	 cache('trials',"images/izq.gif","images/izq1.gif");
	 cache('cursos',"images/izq.gif","images/izq1.gif");
	cache('pasantias',"images/izq.gif","images/izq1.gif");
	 cache('oportunidades',"images/izq.gif","images/izq1.gif");
	 cache('asesorias',"images/izq.gif","images/izq1.gif");
	 cache('apertura',"images/izq.gif","images/izq1.gif");
	cache('links',"images/izq.gif","images/izq1.gif");
	cache('inst',"images/izq.gif","images/izq1.gif"); 
	cache('pacientes',"images/izq.gif","images/izq1.gif");  
               cache('os',"images/izq.gif","images/izq1.gif");  
               cache('arte',"images/izq.gif","images/izq1.gif");  
                 cache('inicio',"images/circuloinicio.gif","images/circuloinicio1.gif");  
                       cache('enviar',"images/circuloinicio.gif","images/circuloinicio1.gif");  
                       
                        cache('empresa',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('staff',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('asociadas',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('especialidades',"images/circulomenu.gif","images/circulomenu1.gif");  
                
                cache('indice',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('especial',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('os1',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('urgencia',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('domicilio',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('prestaciones',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('retiro',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('consulta',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('asesoramiento',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('normas',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('manual',"images/circulomenu.gif","images/circulomenu1.gif");  
                cache('pub',"images/circulomenu.gif","images/circulomenu1.gif");
                cache('rep',"images/circulomenu.gif","images/circulomenu1.gif");
                cache('trab',"images/circulomenu.gif","images/circulomenu1.gif");
                cache('a2',"images/circuloinicio.gif","images/circuloinicio1.gif");  
                cache('a3',"images/circuloinicio.gif","images/circuloinicio1.gif");