How to hide an image in ssrs report based on the parameters ?

Hi,

i have added an image in report,After previewing the ssrs report it will show an image in one text box ,when we click on that image it will go to graph report.

Please check the attached image.

My requirement is, in parameters i have accounts,LOBs,Sites,Year,Months,Week and Day,

in the LOBs parameter if we select more than one LOB then only it has to show image in report text box,if we select single lob it should not show image in the report.

and i have tried to write an expression in visibility tab in image properties but it didn't work may be i wrote wrong expression.

if that is the case please suggest me the correct expression. or do i need to do any modifications please suggest me.

Thanks

Naveen