function showImage ( valor,path ) {
	document.getElementById( "big_image").src = path+valor;
	return false;
}
function validar_ajax(f)
{
// compatible con mozilla. xhtml 1.0
// version 2.0 
	var requeridoArray = f.elements['requerido'].value;
	var elemento = f.elements;
	requeridoArray = requeridoArray.split(",");
	
	mode = true;
	
	for (i = 0; i < requeridoArray.length; i++) {

		switch ( requeridoArray[i] ) {
			default:
				field = 'error-'+elemento[ requeridoArray [ i ] ].name;
				var error_message = document.getElementById( field );
				if (elemento[ requeridoArray[ i ] ].value == "" ){
						error_message.innerHTML =  "" + elemento[requeridoArray[i]].title + " is required";	

						elemento[requeridoArray[i]].focus(); 
						elemento[requeridoArray[i]].className += " error"; 				
						mode = false
				}
				else {
					if ( elemento[requeridoArray[i]].name == 'email') {
					// chequeo  de email
						var mail_check = requeridoArray[i].indexOf("mail"); 
						if (mail_check > -1 && (elemento[requeridoArray[i]].value.indexOf('@', 0) == -1 ||
							elemento[requeridoArray[i]].value.indexOf('.', 0) == -1)) {
							error_message.innerHTML =  "Valid email address is required";	
							elemento[requeridoArray[i]].className += " error"; 				
							mode = false; 
						}
						
					}
					else {
						error_message.innerHTML =  " ";	
					}
				}
			break;
		}

	

	
	}//for

	return mode;

}