JavaScript

function repl(url) {
    return url.replace('/', '\/');
}

//the string to work with:
var httpAddress = 'http://examplesite.com/folders/images/myphoto.jpg',
    //the char(s) to look for:
    charToRemp = '/',
    //the char(s) to change to:
    rempCharWith = '\\/';

//using RegExp
function regexp_changeCharsTo(charIn, from, to) {
    var regExpFrom = RegExp(from, 'g');
    return charIn.replace(regExpFrom, to);
}

//using array map
function arrMap_changeCharsTo(charIn, from, to) {
    return charIn
        .split('')
        .map(function (chr) {
            if (chr === from) {
                return to;
            }
            return chr;
        })
        .join('');
}

//using for in loop
function forIn_changeCharsTo(charIn, from, to) {
    var fnString = '';
    for (var cr in charIn) {
        if (charIn[cr] === from) {
            fnString += to;
        } else {
            fnString += charIn[cr];
        }
    }
    return fnString;
}

//Test:
var regexp_test = regexp_changeCharsTo(httpAddress, charToRemp, rempCharWith);
var arrMap_test = arrMap_changeCharsTo(httpAddress, charToRemp, rempCharWith);
var forIn_test = forIn_changeCharsTo(httpAddress, charToRemp, rempCharWith);

function load_template() {
    
    var
    txtFocus,
    txtError,
    m_secureToken,
    m_template,
    m_filePath;
    
    var vFlag = true;
    txtFocus = $('[id*="_txt_Focus_Field"]').val();
    txtError = $('[id*="_txt_Error_Field"]').val();
    m_secureToken = $('[id*="_txt_Secure_Token_Field"]').val();
    m_template = $('[id*="_ddl_CE_FI_Template_Field"] option:selected').text();
    m_filePath = $('[id*="_ddl_CE_FI_Template_Field"]').val();

    if (m_filePath === '--') {
        $('[id*="_ddl_CE_FI_Template_Field"]').css('background-color', txtError);
        $('[id*="_img_CE_FI_Template_Error"]').css('display', 'inline-block');
        vFlag = false;
    }
    else {
        $('[id*="_ddl_CE_FI_Template_Field"]').css('background-color', txtFocus);
        $('[id*="_img_CE_FI_Template_Error"]').css('display', 'none');
    }

    if (true === vFlag) {

        var send_Data =
        "{" +
        "\"p_secureToken\" : \"" + m_secureToken + "\", " +
        "\"p_template\" : \"" + escape(m_template) + "\", " +
        "\"p_filePath\" : \"" + escape(m_filePath) + "\"  " +
        "}";

        alert(send_Data);

        $.ajax({
            type: "POST",
            contentType: "application/json; charset=utf-8",
            url: "broadcastEditor.asmx/preview_Template",
            data: send_Data,
            dataType: "json",
            error: function (xhr, status, error) {
                exitCode = 2;
                $('[id*="_updateProgress_Unified"]').fadeOut('fast', function () {
                    alert(xhr.responseText);
                });
            },
            success: function (responseText) {
                var objB = jQuery.parseJSON(responseText.d);
                exitCode = objB.exitCode;
                var p_Stream = unescape(objB.p_Stream.replace(/\+/g, " "));

                $('[id*="_panel_CE_Container_XHTML"]').append(p_Stream);
                $('[id*="_updateProgress_Unified"]').fadeOut('fast');
                $('[id*="_panel_CE_Container_XHTML"]').fadeIn('normal');
                         
            }
        });

    }

}