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

function writeEqn(){
     string1 = "$\\begin{array}{rcl}f'(x)&=&\\altLink{\\lim_{h\\rightarrow 0}\\,\\frac{f(x+h)-f(x)}{h}}{Step 1.}\\\\"
     string2 = "&=&\\altLink{\\lim_{h\\rightarrow 0}\\,\\frac{b^{x+h}-b^x}{h}}{Step 2.}\\\\"
     string3 = "&=&\\altLink{\\lim_{h\\rightarrow 0}\\,\\frac{b^x b^h - b^x}{h}}{Step 3.}\\\\"
     string4 = "&=&\\altLink{\\lim_{h\\rightarrow 0}\\,b^x\\cdot\\frac{b^h - b^0}{h}}{Step 4.}\\\\"
     string5 = "&=&\\altLink{b^x\\cdot\\lim_{h\\rightarrow 0}\\,\\frac{b^h - b^0}{h}}{Step 5.}\\\\"
     string6 = "&=&\\altLink{b^x\\cdot f'(0)}{Step 6.}\\\\"
     string0 = string1+string2+string3+string4+string5+string6+endString
}