Add parameter to "navigation" url

Add parameter to "navigation" url -Hello,I'm trying to add a parameter to my JUMP TO URL but it doesn't work.basiclly i'm useing javascript there:javascript:window.open('http:www.a.com?num=XXX');i want to change the XXX with a value from the dataset.I tried - javascript:window.open('http:www.a.com?num= + Fields!ME.Value ');or - javascript:window.open('http:www.a.com?num= & Fields!ME.Value ');it didn't worked :(any help?

Hi,

="javascript:void(window.open('" &"https://va1/coretraining/Reports/DisplayReport.aspx?Report=CaseDetail&caseID=" & Fields!caCaseID.Value &"'))"

You can try in this way.