var LabelPriceValueClientID = 'ctl00_ctl00_cph1_cph1_ctl00_ctrlProductVariantsInGrid_rptVariants_ctl00_ctrlProductPrice_lblPriceValue';

function onSubscriptionChange(ctrl) {
    var obj = document.getElementById(ctrl.id.toString());
    var x = obj.selectedIndex;
    var text = obj.options[x].text;
    var start = text.indexOf("$");
    var end = text.indexOf("]");
    var amount = text.substring(start, end);
    var span = document.getElementById(LabelPriceValueClientID);
    start = span.innerHTML.indexOf("(");
    end = span.innerHTML.indexOf(")");
    var currencyType = span.innerHTML.substring(start, end + 1);
    span.innerHTML = amount + " " + currencyType;
}