[xsl] Taking string out from the long string

["ashu t" <aashut@xxxxxxxxxxxxxx>]

i want to abstract just the file name from any image file
but not getting it correctly.
during conversion of html to wml when i am fetching the page i am 
converting the .jif or .jpg or whatever image file  into .wbmp 
format and storing them in  a folder.
and in <xsl:template match="img">
what i want to do is that first i want to take the *src* of the 
img tag in html file (which is now well formed xhtml as i am using 
tidy to make them xhtml).which i think i can do by declaring a 
variable and then variable = {@src}(i think it will work)then i 
want to take the string after the last slash(/) in the src which 
is the name of the image file (like src="dir/image.gif") this can 
be done by string = substring-after(string, substring) but the 
problem is that what to do if src is like /images/dir/image.gif 
how can i tell that the string after the last slash is to be 
taken.
and after that what i want to do is want to take the file name 
before the extension like if file name is images.gif then i want 
to take only images (which i think can be done by substring-before  
then i want to add the extension .wbmp to that file (which i think 
can be done by concat(images,.,wbmp) then i am creating an element 
<img and in @src giving the path to my folder containing images as 
they are saved with the same name just having extension .wbmp.

how can i do it
ashu


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