var start = 1;
var perdatapage = 10;
var aantal = 25;
var pages = aantal / perdatapage;
var end = start + (perdatapage - 1);
var criteria = "";
var topval = 10;

function getURL() {
   var s = baseurl;
   s+="start="+start;
   s+="&end="+end;
   s+="&criteria=" + criteria;
   return s;
}

function filterDataset(formCriteria) {
	criteria=formCriteria;
	start=1;
	end=20;
	dsBasis.setURL(getURL());
	dsBasis.loadData();
}

function goBack() {
  start=start-1;
  if(start < 1) start=1;
  end = start+perdatapage;
  loadSpry();
}

function goForward() {
	start=start + 1;
	end = start+(perdatapage - 1);
  loadSpry();
}

function jumpTo(nStart, nEnd) {
  start = nStart;
  end = nEnd;
  loadSpry();
}

function loadSpry() {
  dsBasis.setURL(getURL());
  dsBasis.loadData();
//	pages.setURL(getURL());
//  pages.loadData();
}