function form_uno(num_form,num_elem_form,color_entrada)
{
	document.forms[num_form].elements[num_elem_form].style.backgroundColor='CCFF99';
	//document.forms[num_form].elements[num_elem_form].focus();
}
function form_dos(num_form,num_elem_form,color_default)
{
	document.forms[num_form].elements[num_elem_form].style.backgroundColor=color_default;
} 

function validalogin(form){
	
	if (form.Usuario.value.length==0)
	{
		alert("Introduzca un usuario");
			   form.Usuario.focus();
			   return false;
	}
	if (form.Password.value.length==0)
	{
		alert("Introduzca un Password");
			   form.Password.focus();
			   return false;
	}
	return true;
}