var app = Sys.Application;

app.add_init(ApplicationInit);

function ApplicationInit(sender) {
    var prm = Sys.WebForms.PageRequestManager.getInstance();
    if (!prm.get_isInAsyncPostBack()) {
        if (typeof contentPageLoad == "function") {
            prm.add_pageLoaded(contentPageLoad);
        }
        if (typeof onPageLoad == "function") {
            prm.add_pageLoaded(onPageLoad);
        }
        if (typeof onEndRequest == "function") {
            prm.add_endRequest(onEndRequest);
        }
    }
}