function vn(e){
	e = e ? e : event;
	var kc = e.which ? e.which : e.keyCode;
	if(
		kc == 8 ||
		kc == 37 ||
		kc == 38 ||
		kc == 39 ||
		kc == 40 ||
		kc == 46 ||
		kc == 13
	) return true;

	if(kc < 48 || kc > 58){
		e.cancelBuble = true;
		e.returnValue = false;
		return false;
	}
}

function pop(href, w, h, sb){
	window.open(
		href,
		'popupwindow',
		'width=' + w + ',height=' + h + ',left=' + (screen.availWidth - w) / 2 + ',top=100,scrollbars=' + sb + ',resizable'
		);
	return false;
}

Array.prototype.map = function(fn) {
  var r = [];
	var l = this.length;
	for(i=0;i<l;i++){
	  r.push(fn(this[i]));
  }
	return r;
};


function compute_features(el){
  
  var feature_selects = el.getElementsByClassName("feature_select");
  var feature_values = [];
  
  for(var i = 0; i < feature_selects.length; i++){
    feature_values.push(feature_selects[i].value);
  }
  
  el.elements[0].value = feature_values.join(', ');

  return true;
  
}


var getElementsByClassName = function (className, tag, elm){
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className),
				nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
				returnElements = [],
				current;
			for(var i=0, il=elements.length; i<il; i+=1){
				current = elements[i];
				if(!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = "",
				xhtmlNamespace = "http://www.w3.org/1999/xhtml",
				namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
				returnElements = [],
				elements,
				node;
			for(var j=0, jl=classes.length; j<jl; j+=1){
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try	{
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = [],
				elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
				current,
				returnElements = [],
				match;
			for(var k=0, kl=classes.length; k<kl; k+=1){
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for(var l=0, ll=elements.length; l<ll; l+=1){
				current = elements[l];
				match = false;
				for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};