OpenDoc from Design Studio not parsing

Hello Experts...

I am having issues implementiong openDoc from DS1.6SP2. When I hardcode within " " it works fine. But when I change the code to dynamically pass value, the code is not parsing. It is expecting " " which doesn't make sense. I have attached both the syntax for Ref.

Parsed:

APPLICATION.openNewWindow("http://<server>:8080/BOE/OpenDocument/opendoc/openDocument.jsp?sIDType=CUID&iDocID=AQNHxxx" + "&lsSPlant=1"+"&sRefresh=Y");

Not Parsing:

APPLICATION.openNewWindow("http://<server>:8080/BOE/OpenDocument/opendoc/openDocument.jsp?sIDType=CUID&iDocID=AQNHxxx" + "&lsSPlant=" + CHART_1.getSelectedMember("0PLANT") + "&sRefresh=Y");

Thanks

Ravi