multivalued parameters for stored procedure in ssrs

hi,
i have a stored procedure and has 3 parameters, like projectname,project leader, dept. i am able to pass single value using sp,but multiple values using a query. when i use select all in the drop down box of the parameter list, it takes value in csv format? isnt it? so if i am using the sp it is not accepting multiple value , i mean if i select the select all check box, i am unable to generate the report, but query works fine with the select all option.
so can anyone tell me the way in which a sp can accept the multiple values in each parameter??

Check on these links: They may help you.
http://weblogs.asp.net/jmoon/archiv....asp.net/jmoon/archive/2005/04/01/396649.aspx
http://sqlserveruniverse.com/forums/thread/480.aspx

THANK YOU

[quote user="Madhivanan"]
The first link throws with the error Bad RequestBad Request
[/quote]
That is a nice way of pointing my Double paste error []
http://weblogs.asp.net/jmoon/archive/2005/04/01/396649.aspx is the first link