function showlayer(elementid){ 

  document.getElementById(elementid).style.display="";

//looks for the style and display settings of object whose name matches
//the value you passed to the function and unhides it.

}

function isAlien(a) {
   return isObject(a) && typeof a.constructor != 'function';
}

function isArray(a) {
    return isObject(a) && a.constructor == Array;
}

function isBoolean(a) {
    return typeof a == 'boolean';
}

function isEmpty(o) {
    var i, v;
    if (isObject(o)) {
        for (i in o) {
            v = o[i];
            if (isUndefined(v) && isFunction(v)) {
                return false;
            }
        }
    }
    return true;
}

function isFunction(a) {
    return typeof a == 'function';
}

function isNull(a) {
    return typeof a == 'object' && !a;
}

function isNumber(a) {
    return typeof a == 'number' && isFinite(a);
}

function isObject(a) {
    return (a && typeof a == 'object') || isFunction(a);
}

function isString(a) {
    return typeof a == 'string';
}

function isUndefined(a) {
    return typeof a == 'undefined';
} 

function handle_altro(option_list)
{
	var tos = null;
	if (isArray(option_list.value)) {
		tos = option_list.value.join();
	} else {
		tos = option_list.value;
	}

	if (tos.match("_altro_")) {
		name = prompt(option_list.name, "");

		if (name != null) {
			option_list.value = name;
			var altro = document.getElementById(option_list.name + "altro");
			altro.value = name;
			altro.innerHTML = "Altro... (" + name + ")";
//			altro.text = "Altro... (" + name + ")";
		}
	} else { 
	  if (tos.match("_all_")) {

		expand_list(option_list.name);

     } else {
		if (option_list.name != "zkeys[]") {
			var altro = document.getElementById(option_list.name + "altro");
			if (altro != null) {
			  altro.innerHTML = "Altro...";
			  altro.value = "_altro_";
			}
		}
	  }
	}
}



function handle_altro2(option_list)
{
	alert ("ciao!");
	var altro = document.getElementById(option_list.name + "altro");
	
	var tos = null;
	if (isArray(option_list.value)) {
		tos = option_list.value.join();
	} else {
		tos = option_list.value;
	}

	alert(tos);
	if (tos.match("_altro_")) {
		name = prompt(option_list.name, "");
		if (name != null) {
			option_list.value = name;
			altro.value = name;
			altro.innerHTML = "Altro... (" + name + ")";
		}
	} else { 
	  if (tos.match("_all_")) {

//		expand_list(option_list.name);

//	    other_list = document.getElementById(option_list.id.substr(0,strpos(option_list.id, "_")) + "_all");
//	    if (other_list) {
// 	      option_list.style.visibility = "hidden";
//	      other_list.style.visibility = "visible";
//	    }
     } else {
		if (option_list.name != "zkeys[]") {
			altro.innerHTML = "Altro...";
			altro.value = "_altro_";
		}
	  }
	}
//	option_list.style.visibility = 'hidden';
}

function getRss(category)
{
	if (category.value == "cerca") {
		name = prompt('Parola da cercare:', "");
		if (name != null) {
		    newoption = document.createElement('OPTION');
			newoption.innerHTML = name;
			newoption.value = name;
			newoption.selected = true;
			while(category.tagName != 'SELECT') {
				category = category.parentNode;
			}
			category.appendChild(newoption);
		}
	}
	if (category.value == "dove") {
		dove = prompt('Indica un luogo (cittą, paese ecc., cancel per rimuovere):', "");
		if (dove == null) {
		  dove = "";
		}
		child = document.getElementById("dove");
		child.innerHTML = "Dove = " + dove;
		child.value = "Dove = " + dove;
	}
	while(category.tagName != 'FORM') {
		category = category.parentNode;
	}
	category.submit();
//	while(category != null && category.tagName != 'FRAMESET') {
//		category = category.parent;
//	}
}

var clickedNews = undefined;
var clickedNewsId = undefined;
var clickedParent = undefined;
var clickedNewsText = "";

function toggleDescription2(elementid)
{
  if(clickedNews){
    clickedNews.innerHTML = clickedNewsText;
  }
  clickedNews = document.getElementById(elementid);
  clickedNewsText = clickedNews.innerHTML;
  
  var fullNews = document.getElementById('h' + elementid);
  clickedNews.innerHTML = fullNews.value;
}

function toggleDescription(elementid)
{
  if(clickedNews) {
    clickedNews.innerHTML = clickedNewsText;
  }
  clickedNews = document.getElementById(elementid);
  clickedNewsText = clickedNews.innerHTML;
  
  var fullNews = document.getElementById('h' + elementid);
  clickedNews.innerHTML = fullNews.innerHTML;
}

function strpos(str, ch) {
  for (var i = 0; i < str.length; i++)
  if (str.substring(i, i+ch.length) == ch) return i;
  return -1;
}

function chainUnchain(element)
{
	if (strpos(element.src,"zchain.jpg") > -1) {
      alert("apro");
	  element.src="zchain_open.jpg"
	} else {
	  element.src="zchain.jpg"
    }
}