Transforming xml to html using xsl in PHP

Hi,
  I am using PHP for generating html giving xml and
xsl file to xslt_process() in php.
I am getting problem in accessing relative path of xsl
file. I have many XSL file which linked using
<xsl:import>. I am getting error unable to open this
file. 

How to solve this problem ? Any idea?
Please give your reply that will be helpful for me.

I am getting this while running php file
Warning: Sablotron error on line 5: cannot open file 

Any suggestion to solve this problem. 
thanks,
Regards
Arul

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