function check_form() {
	
	if ( document.paso1.es != undefined ) {
		
		if ( document.paso1.usu.value == "" ) {
			alert( "Debe ingresar Usuario." );
			document.paso1.usu.focus();
			return false;
		}
		
		if ( document.paso1.pas.value == "" ) {
			alert( "Debe Ingresar Clave" );
			document.paso1.pas.focus();
			return false;
		}
		
		
	}else{
		
		if ( document.paso1.usu.value == "" ) {
			alert( "You must complete your Username." );
			document.paso1.usu.focus();
			return false;
		}
		
		if ( document.paso1.pas.value == "" ) {
			alert( "You must complete your Password." );
			document.paso1.pas.focus();
			return false;
		}
		
		
		
	}
			
	return true;
}