$(document).ready(function(){
    $(".btn_request").colorbox({width:"700px", inline:true, href:"#consult_form_popup"});
    $(".phone_us").colorbox({width:"700px", inline:true, href:"#c2c_form"});
});

var params = {
    changedEl: ".custom_sel select",
    visRows: 10,
    scrollArrows: true
}

cuSel(params);