<!--// JavaScript Document

var fondo=1;
function cambiarFondo(){
	if(fondo==1){
		document.body.style.backgroundImage='url(images/bg_body2.jpg)'; 
		document.body.style.backgroundRepeat='repeat-x';
		fondo=2;
	} else {
		document.body.style.backgroundImage='url(images/bg_body.jpg)'; 
		document.body.style.backgroundRepeat='repeat';
		fondo=1;
	}
}

function fondoNegro(){
	if(document.body.style.backgroundImage=="url(nada)"){
		if(fondo==2){
			document.body.style.backgroundImage='url(images/bg_body2.jpg)'; 
			document.body.style.backgroundRepeat='repeat-x';
		} else {
			document.body.style.backgroundImage='url(images/bg_body.jpg)'; 
			document.body.style.backgroundRepeat='repeat';
		}
	} else {
		document.body.style.backgroundImage="url(nada)"; 
		document.body.style.backgroundColor="#000000";	
	}

}

function validaLog(){
    if ((document.logg.user.value.length==0)||(document.logg.pass.value.length==0)){
		alert("Tiene que escribir su nombre de usuario y contraseña");
		return (false);		
	} else {
		document.logg.submit(); 
    } 	
	
}


-->