function tests(){
 alert(document.forms['fdate'].dfrom.value);
}


function updateGraph(gtype){
	var surv = document.getElementById('filter_survey_select');
	var dfrom = document.forms['fdate'].dfrom.value;
	var dto = document.forms['fdate'].dto.value;
	var surv_value = surv.options[surv.selectedIndex].value;

	var req = 'gtype='+gtype+'&from='+dfrom+'&to='+dto;
	if(surv_value !=0){
		req+='&surv_id='+surv_value;
	}
	init();
	xhtml.open('POST','handler/graphHandle.php',true);
	xhtml.onreadystatechange = handleUpdateGraph;
	xhtml.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	xhtml.send(req);
}

function handleUpdateGraph(){
	if(xhtml.readyState == 4){
		if(xhtml.status == 200){
			document.getElementById('graphic').innerHTML = xhtml.responseText;
		}
	}
}