//Cross browser method to get an object
function getObject(id)
{
    if (document.getElementById)
        //IE 5.x or NS 6.x or above
        return document.getElementById(id);
    else if (document.all)
        //IE 4.x
        return document.all[id];
    else
        //Netscape 4.x
        return document[id];
}

//Update the chart according to user selection
function updateChart(simbol)
{
    //
    //we encode the values of all form elements as query parameters
    //
			
			if (simbol) { document.getElementById("simbol").value=simbol; }
			
			
			var elements = getObject("FormData").elements;
			var url = "chart.php?";
			for (var i = 0; i < elements.length; ++i)
			{
				var e = elements[i];
				if (e.type == "checkbox")
					url = url + e.id + "=" + (e.checked ? "1" : "0") + "&";
				else
					url = url + e.id + "=" + escape(e.value) + "&";
			}
		
		
			  getObject("ChartImage").src = url;
			  getObject("historyLink").href="symbolTradeDetails.php?s=" + simbol;
}