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Problem with singularities in Plot3D


Hi,
 
I have a little problem with the Plot3D command of Mathematica.
I want to plot the 3D graphics of :
 
eqt[q_,N_,M_]:= - (3*q/(8*Pi))*(Sum[(Cos[4*Pi*n*d]/(2*n*d))-(Sin[4*Pi*n*d]/(8*Pi*(n*d)^2))-(Cos[4*Pi*n*d]/(32*Pi^2*(n*d)^3)),{n,1,N}] - Sum[(Cos[4*Pi*Abs[z0-m*d]]/Abs[z0-m*d])-(Sin[4*Pi*Abs[z0-m*d]]/(4*Pi*Abs[z0-m*d]^2))-(Cos[4*Pi*Abs[z0-m*d]]/(16*Pi^2*Abs[z0-m*d]^3)),{m,-M,M}])
 
Plot3D[Evaluate[eqt[1,10,10]],{z0,0,3},{d,0.1,6},PlotPoints->50];
 
Like you see, my expression eqt[q,N,M] have some singularities at d = 0 and Abs[z0-m*d] = 0.
 
How can i say to Mathematica that it must ignore the singularities Abs[z0-m*d] = 0 ?
 
Thanks for your help.
 
Steeve Brechmann von Brechenmacher
Physics Department, Laval University
steevebrechmann at yahoo.ca



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