I am having a problem with the “&” character when trying to pass MDX
Parameters through Jump to URL.  
Originally the report worked fine using “Jump to Report” but the users
wanted the drillthough report to open in a new window.  I found this java
script and I can get it to open a new window but when I try to feed the
parameters it errors out because of the “&” character in the parameter value
([Time].[Time Year Month].[Month].&[200701]).  It appears to automatically
convert “[“ but has trouble on the “&.”  

This will work but I need it to open in a new window
="http://RXX123/Reportserver?%2fCLCGlobalProdTest%2fPlan+vs+Actual+-+Sales+-+Consolidated&rs:Command=Render&FromTimeTimeYearMonth="&Replace(Parameters!FromTimeTimeYearMonth.value,"&","%26")
It produces the following working URL
http://chvpkntah3d222/ReportServer/Pages/ReportViewer.aspx?%2fCLCGlobalProdTest%2fPlan+vs+Actual+-+Sales+-+Consolidated&rs:Command=Render&FromTimeTimeYearMonth=%5BTime%5D.%5BTime%20Year%20Month%5D.%5BMonth%5D.%26%5B200701%5D

This does not work:
="javascript:void(window.open('http://
RXX123/Reportserver?%2fCLCGlobalProdTest%2fPlan+vs+Actual+-+Sales+-+Consolidated&rs:Command=Render&FromTimeTimeYearMonth="+Replace(Parameters!FromTimeTimeYearMonth.value,"&","%26")+"'))"
It produces the following URL:
http://
RXX123/ReportServer/Pages/ReportViewer.aspx?/CLCGlobalProdTest/Plan+vs+Actual+-+Sales+-+Consolidated&rs:Command=Render&FromTimeTimeYearMonth=%5BTime%5D.%5BTime%20Year%20Month%5D.%5BMonth%5D.&%5B200701%5D

I even wrote a function to convert & to %26 but it seems to convert the %26
back to & no matter what I do.