var aVar = 1
var bVar = 1
var cVar = 1
var step = 0
var poly
var string1 = "Test"
var string2
var string3
var string4
var string5
var string6
var endString ="\\end{array}"
var string0 = string1+endString

function writeNewEqn(){
   with(Math){
     bVar = round(10*random()+1)
     cVar = round(10*random()+1)
   }
   poly="f(x)=x^2+"+bVar+"x+"+cVar
   step=0
}
function writeEqn(){
   if (step == 0){
     string1 = "\\begin{array}{rcl}\\lim_{h\\rightarrow 0}\\,\\frac{f(x+h)\\,-\\,f(x)}{h}\\,&=&"
     string0 = string1+endString
     step = 1
   }
   else { if (step == 1){
     string2 = "\\lim_{h\\rightarrow 0}\\,\\frac{[(x+h)^2+"+bVar+"(x+h)+"+cVar+"]-[x^2+"+bVar+"x+"+cVar+"]}{h}\\\\" 
     string0 = string1+string2+endString
     step=2
   }
   else { if (step == 2) {
     string3 = "&=&\\lim_{h\\rightarrow 0}\\,\\frac{[(x^2+2xh+h^2)+("+bVar+"x+"+bVar+"h)+"+cVar+"]-[x^2+"+bVar+"x+"+cVar+"]}{h}\\\\"
     string0 = string1+string2+string3+endString
     step=3
   }
   else { if (step == 3) {
     string4 = "&=&\\lim_{h\\rightarrow 0}\\,\\frac{2xh+h^2+"+bVar+"h}{h}\\\\"
     string0 = string1+string2+string3+string4+endString
     step=4
   }
   else { if (step == 4) {
     string5 = "&=&\\lim_{h\\rightarrow 0}\\,2x+h+"+bVar+"\\\\"
     string0 = string1+string2+string3+string4+string5+endString     
     step=5
   }
   else { if (step == 5) {
     string6 = "&=&2x+"+bVar+"\\\\"
     string0 = string1+string2+string3+string4+string5+string6+endString     
     step=6
     document.derivative.Continue.value="Done!"
   }
   }}}}}
}