function ajax(url)
{  
    var xmlHttp;
    var ajaxResult="";
	try
	{
		xmlHttp=new XMLHttpRequest();
	}
	catch (e)
    {    
		try
		{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			try
			{
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
			}
      		catch (e)
        	{        
				alert("Your browser does not support AJAX!");
				return false;
			}
		}
	}
	if(document.getElementById('List1')){
		var List1 = document.getElementById('List1').value;
		var List2 = document.getElementById('List2').value;
		var List3 = document.getElementById('List3').value;
		var List4 = document.getElementById('List4').value;
		var List5 = document.getElementById('List5').value;
		var List6 = document.getElementById('List6').value;
		var List7 = document.getElementById('List7').value;
		
		//alert (List3);
		if (url.indexOf('?')==-1) url+="?";
		url+="&paramRND="+Math.random()*1000;
		url+="&country="+List1;
		url+="&categories="+List2;
		url+="&wyjazd="+List3;
		url+="&period="+List4;
		url+="&transport="+List5;
		url+="&standard="+List6;
		url+="&maintance="+List7;

		xmlHttp.open("GET",url,false);
		xmlHttp.send(null);
		if(xmlHttp.readyState==4)
		{
			ajaxResult=xmlHttp.responseText;
		}
		return ajaxResult; 
	}
}