Edit in JSFiddle

<div id="dchat"></div>

//Next line is to prevent errors in IE while logging to console
if ( ! window.console ) console = { log: function(){} };

var uniqueLeadID = new Date().getTime();

//Next line is to prevent errors in IE while logging to console
if ( ! window.console ) console = { log: function(){} };

$(document).ready(function(){
    $('#dchat').pcclient({
        targetName: 'pushcall',
        clientType: 'chat',
        locale: 'nl',
        forceHTML: true,
        customData: 'LEAD ID = ' + uniqueLeadID,
        eventCallback: function (event, eventData) {
            console.log("eventCallback: %o %o", event, eventData);
        }
    });	
});

#dchat {
    width:500px;
    height: 500px; 
}