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