function checkscript() {

var boxesTicked = ""

for (i = document.getElementsByName('chkboxes').length - 1; i >= 0; i--) {

if (document.getElementsByName('chkboxes')[i].checked) {

boxesTicked = boxesTicked + document.getElementsByName('chkboxes')[i].value + "\n"

}

}

if (boxesTicked == "") {
alert ("You must select a box to continue.")
return false
}
else {
alert (boxesTicked)
return true;
}

}