function addToCart(id) {
    var oTextBox; 
    var iQty = 0;
    var sId = id;
    oTextBox = eval("document.forms[0].txtQty_"+id);
    
    if (!isNaN(oTextBox.value)) {
        iQty = parseInt(oTextBox.value);
        //alert("Buying " + iQty + " of product id " + sId);
        window.location.href = "/AddToCart.aspx?qty=" + iQty + "&id=" + sId;
    }
    else {
        alert("You must enter a number for your quantity.");
    }
}
function increment(id) {
    var oTextBox; 
    oTextBox = eval("document.forms[0].txtQty_"+id);
    if (!isNaN(oTextBox.value)) {
        oTextBox.value = 1 + parseInt(oTextBox.value);
    }
    else {
        alert("You must enter a number for your quantity.");
    }
}
function decrement(id) {
    var oTextBox; 
    oTextBox = eval("document.forms[0].txtQty_"+id);
    if (!isNaN(oTextBox.value)) {
        if (parseInt(oTextBox.value) == 1) {
            alert("You can\'t add less than one item to your cart.");
        }
        else {
            oTextBox.value = parseInt(oTextBox.value) - 1;
        }
    }
    else {
        alert("You must enter a number for your quantity.");
    }
}