function validar()
{
	campo=document.getElementById('numero').value;
	vacio=true;
	for ( i = 0; i < campo.length; i++ ) {  
        if ( campo.charAt(i) != " " ) { vacio=false;	}  
    }
	if(vacio){ 
		alert('Digite el Numero de Cedula.'); 
	}
	else{
		var formulario=document.getElementById("formulario");
		formulario.submit();
	}
}
var nav4 = window.Event ? true : false;
function acceptNum(evt){
// NOTE: Backspace = 8, Enter = 13, '0' = 48, '9' = 57
var key = nav4 ? evt.which : evt.keyCode;
return (key <= 13 || (key >= 48 && key <= 57));
}