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problem with InverseLaplaceTransform


Hi,



I'm pretty new to Mathematica and am having difficulty trying to derive 
an inverse laplace transform using Mathematica.  When I run the code, 
Mathematica starts to run (says "running..."), but then just continues 
to remain like that and doesn't give an answer....as if it has crashed 
or something.  The code I`m trying to run is below (layout messed up, 
but if you copy and paste it back into Mathemtica it`s fine):



InverseLaplaceTransform[{{(muone (mufour + s) (lambdathree + muthree +

                  s) (lambdatwo + mutwo + s) +

            lambdaone (lambdathree (lambdatwo mufour +

                        mutwo (mufour + s)) + (mufour +

                        s) (lambdatwo muthree +

                        mutwo (muthree + s))))/(s (mufour + s) 
(lambdaone +

                muone + s) (lambdathree + muthree + s) (lambdatwo + 
mutwo +

                s) (1 - (muone (mufour + s) (lambdathree + muthree +

                            s) (lambdatwo + mutwo + s) +

                      lambdaone (lambdathree (lambdatwo mufour +

                                  mutwo (mufour + s)) + (mufour +

                                  s) (lambdatwo muthree +

                                  mutwo (muthree + s))))/((mufour +

                          s) (lambdaone + muone + s) (lambdathree + 
muthree +

                          s) (lambdatwo + mutwo + s))))}}, s, t]



Can anybody explain my problem?



Thanks,

Barry




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