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

function writeEqn(){
   if (step == 0){
     string1 = "\\begin{array}{rcl}(f\\,\\cdot g)'(x)&=&\\lim_{h\\rightarrow 0}\\,\\frac{(f\\,\\cdot g)(x+h)-(f\\,\\cdot g)(x)}{h}\\\\"
     string0 = string1+endString
     step = 1
   }
   else { if (step == 1){
     string2 = "&=&\\lim_{h\\rightarrow 0}\\,\\frac{f(x+h)\\cdot g(x+h)-f(x)\\cdot g(x)}{h}\\\\"
     string0 = string1+string2+endString
     step=2
   }
   else { if (step == 2) {
     string3 = "&=&\\lim_{h\\rightarrow 0}\\,\\frac{f(x+h)\\cdot g(x+h)-f(x+h)\\cdot g(x) + f(x+h)\\cdot g(x)-f(x)\\cdot g(x)}{h}\\\\"  
     string0 = string1+string2+string3+endString
     step=3
   }
   else { if (step == 3) {
     string4 = "&=&\\lim_{h\\rightarrow 0}\\,f(x+h)\\cdot \\frac{g(x+h)-g(x)}{h} + \\frac{f(x+h)- f(x)}{h}\\cdot g(x)\\\\"
     string0 = string1+string2+string3+string4+endString
     step=4
   }
   else { if (step == 4) {
     string5 = "&=&\\lim_{h\\rightarrow 0}\\,f(x+h)\\cdot \\lim_{h\\rightarrow 0}\\,\\frac{g(x+h) -g(x)}{h}+ \\lim_{h\\rightarrow 0}\\,\\frac{f(x+h)-f(x)}{h}\\cdot \\lim_{h\\rightarrow 0}\\,g(x)\\\\"
     string0 = string1+string2+string3+string4+string5+endString
     step=5
   }
   else { if (step == 5) {
     string6 = "&=&f(x)\\cdot g '(x) + f\\, '(x) \\cdot g(x)"
     string0 = string1+string2+string3+string4+string5+string6+endString
     step=6
     document.derivative.Continue.value="Done!"
   }
   }}}}}
}