Whad you shouldn't do with DHTML

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Somebody have a clue about what not to do with DHTML .. I have seen some libreries about thow to draw lines, but when you try to do something dynamic (like a line that follow the mouse) it is very slow ... I have read about the method to draw lines, and the best is to decrease the amount of DIVs used to draw diagonals ... but it is difficult, one diagonal has many points so each point mean one div .... that a lot of divs ..... it seems not good to used dhtml to draw lines there are another thinks we shouldn't do ... there is another method to draw diagonals Thanks