var dialogNode = xml.find(function(element){
    var objectParams = myGetTagParams(element.nodeName);

    return (objectParams.type == 'my:dialog');
});

var dialogNode = '';

for (var index in xml)
{
    var element = xml[index];

    var objectParams = myGetTagParams(element.nodeName);

    if (objectParams.type == 'my:dialog')
    {
        dialogNode = element;
        break;
    }
}

if (Array.prototype.find == undefined)
    Array.prototype.find = function(){}