function mostra(a)
{
	if (document.getElementById(a).style.visibility == 'hidden'){
	 document.getElementById(a).style.visibility = 'visible';
	 document.getElementById(a).style.display = 'block';
	}else{
		document.getElementById(a).style.visibility = 'hidden';
		document.getElementById(a).style.display = 'none';
	}
}
function mostra_col(a, b){
    if (document.getElementById(a).style.visibility == 'hidden') {
       
	    document.getElementById(a).style.visibility = 'visible';
        // a 
        try {
            document.getElementById(a).style.display = 'table-row';
        } 
        catch (err) {
            document.getElementById(a).style.display = 'block';
        }
		
		
        // b
        try {
            document.getElementById(b).style.visibility = 'visible';
            try {
                document.getElementById(b).style.display = 'table-row';
            } 
            catch (err) {
                document.getElementById(b).style.display = 'block';
            }
        } 
        catch (err) {
        }
        
    }
    else {
        //a
        document.getElementById(a).style.visibility = 'hidden';
        document.getElementById(a).style.display = 'none';
        try {
            //b
            document.getElementById(b).style.visibility = 'hidden';
            document.getElementById(b).style.display = 'none';
        } 
        catch (err_) {
        }
    }
}


//jQuery Framework --- NOT Prototype
function del_image(html_id_img, id_img)
{
    $.ajax({
        type: "POST",
        url: "funzioni_controllo_form.php",
        data: "id_img=" + id_img,
        success: function(msg){
			document.getElementById(html_id_img).innerHTML = msg;
        }
    });
}

// $("#results").append(html);