var step=0
var string1 = "Test"
var string2
var string3
var string4
var string5
var string6
var string7
var endString ="\\end{array}"
var string0 = string1+endString

function writeEqn(){
   if (step == 0){
     string1 = "\\begin{array}{rcl}\\frac{d}{dx}\\sin(x)&=&\\lim_{h\\rightarrow 0}\\frac{\\sin(x+h)-\\sin(x)}{h}\\\\"
     string0 = string1+endString
     step = 1
   }
   else { if (step == 1) {
     string2 = "&=&\\lim_{h\\rightarrow 0}\\,\\frac{\\sin(x)\\cos(h)+\\cos(x)\\sin(h)-\\sin(x)}{h}\\\\"
     string0 = string1+string2+endString
     step=2
   }
   else { if (step == 2) {
     string3 = "&=&\\lim_{h\\rightarrow 0}\\,\\frac{\\sin(x)\\cos(h)-\\sin(x)}{h}+\\frac{\\cos(x)\\sin(h)}{h}\\\\"
     string0 = string1+string2+string3+endString
     step=3
   }
   else { if (step == 3) {
     string4 = "&=&\\lim_{h\\rightarrow 0}\\,\\frac{\\sin(x)\\cos(h)-\\sin(x)}{h}+\\lim_{h\\rightarrow 0}\\,\\frac{\\cos(x)\\sin(h)}{h}\\\\"
     string0 = string1+string2+string3+string4+endString
     step=4
   }
   else { if (step == 4) {
     string5 = "&=&-\\sin(x)\\cdot\\lim_{h\\rightarrow 0}\\,\\frac{1-\\cos(h)}{h}+\\cos(x)\\cdot\\lim_{h\\rightarrow 0}\\,\\frac{\\sin(h)}{h}\\\\"
     string0 = string1+string2+string3+string4+string5+endString
     step=5
   }   
   else { if (step == 5) {
     string6 = "&=&-\\sin(x)\\cdot 0+\\cos(x) \\cdot 1\\\\"
     string0 = string1+string2+string3+string4+string5+string6+endString     
     step=6
   }
   else { if (step == 6) {
     string7 = "&=&\\cos(x)"
     string0 = string1+string2+string3+string4+string5+string6+string7+endString
     step=7
     document.derivative.Continue.value="Done!"
   }
   }}}}}}
}