iRule to redirect a variable to http

Hello...I have one problem for setting up an iRule (i m new for iRule)

 

 

I have requirement that when one of the pool member is Down of VIP, then the connection should redirect to HTTP://Sorry page..

 

 

for eg: if pool is ' Pool_Test_Sorry_Alfresco' and url is 'http://dev-sorry-webarch.xyz.com'..then how to set iRule to get this result...

 

 

Please provide solution....

 

 

Thanks in Advance