reading value of a key in a property file using richfaces

[kish kumar]

hi

i have a property file as below

zzzzzz_a=some text1
zzzzzz_b=some text2
zzzzzz_c=some text3
zzzzzz_d=some text4

Now i have <rich:toolTip direction="top-right" value="#{key}"/> in a loop.
i have static key part zzzzzz_ to this i have to append a,b,c and d and supply it to value attribute.
how this can be done ,i mean i want syntax?