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Controlling model transparency [SOLVED]

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I was wondering if it is possible to control textured model transparency accordingly:
void drawStuff() {
  setTransparency(alpha); // set transparency for model.
  glDrawElements(...);    // draw model with transparency
}
/* ... */

void setTransparency(float alpha) {
  alpha=clamp(alpha,0,1);
  /*
   *  ?
   */
}

I'm looking for a solution which is something like this. Is this possible? As I was researching this I noticed glTexEnv was mentioned few times, but I don't quite get it :| EDIT: Adding following code solved the case:
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor4f(1,1,1,alpha);
my problem was that I had the "glEnable(GL_COLOR_MATERIAL);" missing. I think this is because I had lighting enabled. [Edited by - rxa on February 23, 2010 11:20:21 PM]

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