excel data transfer into SAP internal table with GUI_UPLOAD

hi all,

i m using SRM4 system and i wanted to develop one report which will upload data from excel and convert it into IT.

i know that many threads are posted on this topic.

but my requirement is slight different. in the system only one function module is available that is "GUI_UPLOAD" and we want that user shd not save file as tab delimited before calling this fm. instead, program shd take care of all these things...

please suggest something asap..

helpful ans will be rewarded..

thanks,

jigs.