How to make non editable page while loading asp.net page.

// Get the PageRequestManager instance
var pageRequest = Sys.WebForms.PageRequestManager.getInstance();
// Add the beginRequest Event
pageRequest.add_beginRequest(beginRequest);
// Add the endRequest Event
pageRequest.add_endRequest(endRequest)

// Handle the Begin event
function beginRequest(sender, eventArgs) {

    document.getElementById("contentFrame").disabled = true;
    var nodes = document.getElementById("contentFrame").getElementsByTagName('*');
    for (var i = 0; i < nodes.length; i++) {
        nodes[i].disabled = true;
    }
}

function endRequest(sender, eventArgs) {
    document.getElementById("contentFrame").disabled = false;
    var nodes = document.getElementById("contentFrame").getElementsByTagName('*');
    for (var i = 0; i < nodes.length; i++) {
        nodes[i].disabled = false;
    }
}