var maxSelect = 20;

//function to make sure that a multi select box doesn't have
//more than a maximum number of items selected
function checkMultiSelectMax(select) {
    var selected = 0;

    //count the number of items selected from the select
    for (var i = 0; i < select.length; i++) {
        if (select[i].selected) {
            selected++;
        }
    }

    if (selected > maxSelect) {
        alert("You can only select a maximum of " + maxSelect + " rooms!");
        return false;
    }
    return true;
}


function checkConfig(form) {
    var configSelects = new Array();
    var i;
    var state;
    var defaultYear;
    var defaultYearCount = 0;

    configSelects = form.getElementsByTagName('select');
    
    for (i = 0; i < configSelects.length; i++) {
        state = configSelects[i].selectedIndex;
        defaultYear = configSelects[++i].selectedIndex;

        //if the first option('yes') is selected in the default year field
        if (defaultYear == 0) {
            //if the first state is not selected (ie enabled is not selected but default year is)
            if (state != 0) {
                alert('The state of the default year must be \'Enabled\'!');
                return false;
            } else {
                defaultYearCount++;
            }
        }
    }

    if (defaultYearCount != 1) {
        alert('You must select exactly 1 default year!');
        return false;
    }

    return true;
}