function graph(fct,xMin,xMax){
  dotCode = '<div class="point" id="pdot_id"><img src="graph.gif" '+
    'width="1" height="pic_height" alt="pic_alt"></div>\n';

  xCode = '<div class="point" id="xAxis"><table border="0" '+
    'width="x_width" cellspacing="0" cellpadding="0"><tr><td width="100%" '+
    'bgcolor="#000000"><img src="espace.gif" width="1" height="1"></td> '+
    '</tr></table></div>\n';
  
  yCode = '<div class="point" id="yAxis"><table border="0" '+
    'height="y_height" cellspacing="0" cellpadding="0"><tr><td width="100%" '+
    'bgcolor="#000000"><img src="espace.gif" width="1" height="1">'+
    '</td></tr></table></div>\n';
  
  backCode = '<div class="point" id="background"><table border="0" '+
    'height="back_height" width="back_width" cellspacing="0" '+
    'cellpadding="0"><tr><td width="100%" bgcolor="#EEEEEE">&nbsp;</td>'+  
    '</tr></table></div>\n';
  
  if (navigator.appName == 'Netscape'){
    leftCode = 'document.obj_id.left = ';
    topCode = 'document.obj_id.top = ';
  } else {
    leftCode = 'document.all.obj_id.style.left = ';
    topCode = 'document.all.obj_id.style.top = ';
  }

  nbXs =200; 
  nbYs = 200;
  maxYpos = 225; 
  minXpos = 25;
  var x = xMin;
  yZero = Math.abs(eval(fct));
  yMax = yZero;
  yMin = yZero;
  yMin = yZero;
  datas = new Array();
  deltaX = (xMax - xMin) / nbXs;
  i = 0;

  while (x <= xMax){
    var y = eval(fct);
    datas[i] = x + ':' + y;
    yMax = Math.max(y, yMax);
    yMin = Math.min(y, yMin);
    yZero = Math.min(yZero, Math.abs(y))
    x+= deltaX; 
    i++;
  }

  deltaY = nbYs / (yMax - yMin);
  yPos = new Array();
  for (i=0; i<datas.length; i++){
    yPos[i] = maxYpos - (((datas[i].split(':'))[1] - yMin) * deltaY);
  }
  document.write(backCode.replace(/back_width/, nbXs).replace(/back_height/, nbYs));
  eval(leftCode.replace(/obj_id/, 'background') + minXpos);
  eval(topCode.replace(/obj_id/, 'background') + (maxYpos - nbYs));
  if ((xMin * xMax) < 0){
    document.write(yCode.replace(/y_height/, nbXs));
    eval(leftCode.replace(/obj_id/, 'yAxis') + (minXpos - (xMin * (nbXs/(xMax - xMin)))));
    eval(topCode.replace(/obj_id/, 'yAxis') + (maxYpos - nbYs));
  }
  if ((yMin * yMax) <= 0){
    document.write(xCode.replace(/x_width/, nbYs));
    eval(leftCode.replace(/obj_id/, 'xAxis') + minXpos);
    eval(topCode.replace(/obj_id/, 'xAxis') + (maxYpos - ((yZero - yMin) * deltaY)));
  }
  for (i=1; i<(datas.length-1); i++){
    picHeight = Math.abs((yPos[i-1] - yPos[i]) + (yPos[i] - yPos[i+1])) / 2;
    YDPos = yPos[i] - (Math.round(picHeight) / 2);
    document.write(dotCode.replace(/dot_id/, i).replace(/pic_height/,Math.ceil(picHeight)).replace(/pic_alt/, datas[i]));
    eval(leftCode.replace(/obj_id/, 'p' + i) + (minXpos + i));
    eval(topCode.replace(/obj_id/, 'p' + i) + YDPos);
  }
}