function isNumberKey(evt)
    {
     var charCode = (evt.which) ? evt.which : event.keyCode
     if (charCode > 31 && (charCode < 48 || charCode > 57))
        return false;

     return true;
    }

    function btnPurchase_Click() {
        
        var qtyA = Number(document.getElementById("txtA").value);
        var qtyB = Number(document.getElementById("txtB").value);
        var qtyC = Number(document.getElementById("txtC").value);
        var qtyD = Number(document.getElementById("txtD").value);
        var qtyE = Number(document.getElementById("txtE").value);

        var priceA = 30;
        var priceB = 50;
        var priceC = 250;
        var priceD = 300;
        var priceE = 25;
        
        var myQ=new Array(5)
        for (i=0; i < 5; i++)
            myQ[i]=new Array(3)
        
        myQ[0][0] = qtyA;
        myQ[0][1] = priceA;
        myQ[0][2] = "$30 per person";
        myQ[1][0] = qtyB;
        myQ[1][1] = priceB;
        myQ[1][2] = "$50 per couple";
        myQ[2][0] = qtyC;
        myQ[2][1] = priceC;
        myQ[2][2] = "$250 per table of 10";
        myQ[3][0] = qtyD;
        myQ[3][1] = priceD;
        myQ[3][2] = "$300 per corporate table";
        myQ[4][0] = qtyE;
        myQ[4][1] = priceE;
        myQ[4][2] = "$25 per Private Reception ticket";

        var myQS = "";
        var tcount = 1;
        for(i=0;i<myQ.length;i++) {
      
            if(myQ[i][0] != 0) {
                myQS = myQS + "&item_name_" + tcount + "=" + myQ[i][2] + "&amount_" + tcount + "=" + myQ[i][1] + "&quantity_" + tcount + "=" + myQ[i][0];
                tcount++;
            }
        }
        
        //alert(myQS);
        if(myQS != "")
            window.open("https://www.paypal.com/cgi-bin/webscr?cmd=_cart&upload=1&currency_code=USD&business=marypauly48@yahoo.com" + myQS, "_blank");
        else
            alert('Please select a quantity of tickets to purchase'); 
       
    }