var xmlHttp;
		
		function zymeti(product_id)
		{ 
			xmlHttp = GetXmlHttpObject();			
			
			if (xmlHttp == null)
			{
				alert ("Browser does not support HTTP Request");
				return;
			}
			var url = "/check.php";	
			
			var chks = document.getElementsByName('zymejimas[]');
			
			for (var i = 0; i < chks.length; i++)
		    {
				if (chks[i].value == product_id)
		        {				
					if(chks[i].checked)
					{
						act = 'check';
					}
					else
					{
						act = 'uncheck';
					}
		        }
		    }
			
			url = url+"?product_id="+product_id;
			url = url+"&act="+act;						

			xmlHttp.open("GET",url,true);
			xmlHttp.send(null);
		}
		
		function GetXmlHttpObject()
		{
		var xmlHttp=null;
		try
		 {
		 // Firefox, Opera 8.0+, Safari
		 xmlHttp=new XMLHttpRequest();
		 }
		catch (e)
		 {
		 //Internet Explorer
		 try
		  {
		  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		  }
		 catch (e)
		  {
		  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		  }
		 }
		return xmlHttp;
		}