function HDCheck(){
if (document.Packages.HDTV.checked == true && document.Packages.HD_Ultra.checked == true){	
alert("Selecting HDTV Ultra includes HDTV Basic Service.\nHDTV Basic Service has been deselected.")
document.Packages.HDTV.checked = false;	
}}

function DVRCheck(){
if (document.Packages.DVR.checked == true && document.Packages.DVR_HD_Ultra.checked == true){
alert("Selecting the DVR HD Ultra Service includes the basic DVR service.\n DVR service has been deselected.")
document.Packages.DVR.checked = false;
}}

function DVRHDCheck(){
if (document.Packages.HDTV.checked == true && document.Packages.DVR.checked == true){
alert("Selecting the DVR Service includes the HDTV Basic Service.\n HDTV Basic Service has been deselected.")
document.Packages.HDTV.checked = false;
}
if (document.Packages.HDTV.checked == true && document.Packages.DVR_HD_Ultra.checked == true){
alert("Selecting the DVR Service includes the HDTV Basic Service.\n HDTV Basic Service has been deselected.")
document.Packages.HDTV.checked = false;
}}

function DVRHDUltraCheck(){
if (document.Packages.HD_Ultra.checked == true && document.Packages.DVR_HD_Ultra.checked == true){
alert("Selecting the DVR HD Ultra Service does not require the HDTV Ultra Service.\n HDTV Ultra Service has been deselected.")
document.Packages.HD_Ultra.checked = false;
}	
if (document.Packages.HD_Ultra.checked == true && document.Packages.DVR.checked == true){
alert("Selecting the DVR HD Ultra Service does not require the HDTV Ultra Service.\n HDTV Ultra Service has been deselected.")
document.Packages.HD_Ultra.checked = false;
document.Packages.DVR_HD_Ultra.checked = true;
}}


function CheckSelections(obj){
var count = 0
for (i=0;i<obj.elements.length;i++){
	if (obj.elements[i].checked) count = count + 1
}
if (count < 1){
alert("Please select from the list of services above");
return false;
}}

function countTotal(obj){
var total = 0
for (i=0;i<obj.elements.length;i++){
	if (obj.elements[i].checked) total = total + parseFloat(obj.elements[i].value)
}
document.Packages.Total.value = "$" + round_decimals(total,2);
}

function round_decimals(original_number, decimals) {
   var result1 = original_number * Math.pow(10, decimals)
   var result2 = Math.round(result1)
   var result3 = result2 / Math.pow(10, decimals)
   return pad_with_zeros(result3, decimals)
}

function pad_with_zeros(rounded_value, decimal_places) {

    // Convert the number to a string
    var value_string = rounded_value.toString()
    
    // Locate the decimal point
    var decimal_location = value_string.indexOf(".")

    // Is there a decimal point?
    if (decimal_location == -1) {
        
        // If no, then all decimal places will be padded with 0s
        decimal_part_length = 0
        
        // If decimal_places is greater than zero, tack on a decimal point
        value_string += decimal_places > 0 ? "." : ""
    }
    else {

        // If yes, then only the extra decimal places will be padded with 0s
        decimal_part_length = value_string.length - decimal_location - 1
    }
    
    // Calculate the number of decimal places that need to be padded with 0s
    var pad_total = decimal_places - decimal_part_length
    
    if (pad_total > 0) {
        
        // Pad the string with 0s
        for (var counter = 1; counter <= pad_total; counter++) 
            value_string += "0"
        }
    return value_string
}