String.prototype.endsWith = function(str)
{
	return (this.substr(this.length - str.length) == str);
}
String.prototype.contains = function(str)
{
	return (this.indexOf(str) >= 0);
}

var MIN_COMPARE = 1;
var MAX_COMPARE = 5;
		
function doSubmit(form)
{		
	var keys = new Array();
	var i;
	var url;
	
	if ((form.compare.type == 'checkbox' && form.compare.checked) || form.compare.type == 'hidden') {							
		keys[0] = "compare=" + escape(form.compare.value);
	} else {	
		if (form.compare.length == 0)
			return false;
							
		for (var i=0; i<form.compare.length; i++)
		{
			if ( form.compare[i].checked || form.compare[i].type == 'hidden')
			{
				keys[keys.length] = "compare=" + escape(form.compare[i].value);
			}
		}
	}
	
	if (keys.length < MIN_COMPARE)
	{
		url = new String(location.href);

		if (url.indexOf("?"))
			url = url.substring(0, url.indexOf("?"));

		url += "?err=e19";

		window.location.href = url;
		return;
	}

	if (keys.length > MAX_COMPARE)
	{
		url = new String(location.href);
		if (url.indexOf("?"))
			url = url.substring(0, url.indexOf("?"));

		url += "?err=e28";

		window.location.href = url;
		return;
	}
	
	url = new String(form.action);
	if (!url.contains("?"))
		url += "?";
	else
		url += "&";

	url +=  keys.join("&");
	url += "&returnUrl="+escape(window.location.href);

			
	window.location.href = url;
	return;
}