function getCost(form)
{
   var pat = form.patients.value;
   var patcon = 2.50;
   var thebook = form.thebook.value;
   var dnarate = form.dnarate.value / 100;
   var costing = pat * patcon;
   var dnacost = (pat * dnarate) * thebook;
   var rate10 = (form.dnarate.value / 100) * 0.9;
   var cost10 = (rate10 * pat) * thebook;
   var save10 = dnacost - cost10 - costing;
   var rate20 = dnarate * .8;
   var cost20 = (rate20 * pat) * thebook;
   var save20 = dnacost - cost20 - costing;

   document.getElementById("ewaCost").innerHTML = "<strong>&pound;" + (costing.toFixed(2)) + "</strong>";
   document.getElementById("dnaCost").innerHTML = "<strong>&pound;" + (dnacost.toFixed(2)) + "</strong>";
   document.getElementById("a10saving").innerHTML = "<strong>&pound;" + (save10.toFixed(2)) + "</strong>";
   document.getElementById("a20saving").innerHTML = "<strong>&pound;" + (save20.toFixed(2)) + "</strong>";
   document.getElementById("patients").disabled = true;
   document.getElementById("dnarate").disabled = true;
   document.getElementById("thebook").disabled = true;
   document.getElementById("costs").disabled = true;
   document.getElementById("show").disabled = false;
}

function showResults()
{
   document.getElementById("results").style.visibility = "visible";
   document.getElementById("show").disabled = true;
}

function clearResults()
{
   document.getElementById("ewaCost").innerHTML = "";
   document.getElementById("dnaCost").innerHTML = "";
   document.getElementById("a10saving").innerHTML = "";
   document.getElementById("a20saving").innerHTML = "";
   document.getElementById("results").style.visibility = "hidden";
   document.getElementById("patients").disabled = false;
   document.getElementById("dnarate").disabled = false;
   document.getElementById("thebook").disabled = false;
   document.getElementById("show").disabled = true;
   document.getElementById("costs").disabled = false;
}