Object # has no method 'showModalDialog' in chrome.

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Javascript

SharePoint

Hi there,

Consider the following code:

function ShowWelcomeDialog() {
        var data = {};
        
        var options = {
            url: "/_layouts/xxxx/xxxxxss.aspx",
            title: "xxx xxx",
            width: 700,
            height: 950,
            dialogReturnValueCallback: myDialogCallback,
            args: JSON.stringify(data)
        };
        
        SP.UI.ModalDialog.showModalDialog(options);
        return false;
    }

i have this code for a button click and the modal opens fine in firefox and ie. But it doesn't open in Chrome. gives the following error in console:
Uncaught TypeError:Object #<Object> has no method 'showModalDialog'..

Can anybody help me on this...
Thanks in advance..