var num = 0;

function getSummary (t1,t2) {
	var request = GXmlHttp.create();
	request.open("GET", summaryXML, true);
	request.onreadystatechange = function() {
		if (request.readyState == 4) {
			var xmlDoc = GXml.parse(request.responseText);
			var ttt = xmlDoc.documentElement.getElementsByTagName("total");
			var hours = 0; 
			num = 0;
			var savedates = []; var j=0;
			for (var i = 0; i < ttt.length; i++) {
				dates = ttt[i].getAttribute("date");
				var datecheck = new Date(dates);
				if (datecheck.getTime()>=t1 && datecheck.getTime()<t2) {
				  for (var k=0; k < keepXML.length; k++) {
            hours = hours + parseFloat(ttt[i].getAttribute(keepXML[k]+"hours"));
            num = num + parseFloat(ttt[i].getAttribute(keepXML[k]+"num"));
          }
				savedates[j]=dates; j++;  
				}				
			}
			hours=Math.round(hours*10)/10;
			hours_html = hours + ' Hours';
			num_html = num + ' Tremor Events:';
				
      var year = savedates[0].substring(6,10);
      var day = savedates[0].substring(3,5);
      var month = savedates[0].substring(0,2);
      var file = '';
      var reg_array = new Array();
      var region = new Array();
      reg_array[0]="BC"; region[0]="Vancouver Island";
      reg_array[1]="NW"; region[1]="Northern Washington";
      reg_array[2]="SW"; region[2]="Southern Washington";
      reg_array[3]="NO"; region[3]="Northern Oregon";
      reg_array[4]="CO"; region[4]="Central Oregon";
      reg_array[5]="SO"; region[5]="Southern Oregon";
      reg_array[6]="NC"; region[6]="Northern California";
      env_html='<form name="menuform"><select name="menu2" onChange="if(menuform.menu2.selectedIndex > 0) {window.open(menuform.menu2.options[menuform.menu2.selectedIndex].value);} return false;"';
      env_html += '<option selected>'+savedates[0]+'</option>'
      for (var i = 0; i < reg_array.length; i++) {
        file = 'http://grasso.ess.washington.edu/TREM/'+year+month+'/'+reg_array[i]+'_'+year+month+day+'.pdf';
        env_html += '<option value="'+file+'">'+region[i]+'</option>';
      }
      env_html+='</select></form>';

			if (savedates.length==1) {
			  date_html = savedates[0];
			}else {
				date_html = '<a style="font-size:90%;">' + savedates[0] + ' - ' + savedates[j-1] + '</a>';
			}
			document.getElementById("envelopes").innerHTML = env_html;
			document.getElementById("total_date").innerHTML = date_html;
			document.getElementById("total_hours").innerHTML = hours_html;
			document.getElementById("total_num").innerHTML = num_html;
		}
	}
	request.send(null);
	return
}