How to insert custom content inside a JavaScript lightBox?

Good afternoon guys, need a help, I'm learning javascript in the marra and I would like to know how to insert content (in this case a .ctp file) into this light box.

I'm using Cake PHP

Form Button

echo $this->Html->div("col-md-4", $this->Form->button($this->Bootstrap->glyphicon('send') . '  Enviar', ['class' => 'btn btn-primary'
    , 'type' => 'submit'
    , 'id' => 'btnEnviar'
    , 'title' => 'Enviar os comprovantes'
    , 'escape' => false
])

);

Function that opens the light Box

function abrirMensagemBox(title, height, width) {

$jQ = jQuery.noConflict();

$jQ('<div>').dialog({
    modal: true,
    height: height,
    width: width,
    title: title
});

}

Excerpt that calls this function according to a certain condition.

if(selecionou > 0 && erros ===0){
        abrirMensagemBox('Confirmar envio', 500,800)
        return false;
}