var ColorIndex = 0 ;
var ColorArray2 = Array("altRed", "altBlue"); 
var ColorArray = Array("txtRed", "txtBlue"); 

function ChangeColor(){ 

(ColorIndex < ColorArray.length-1) ? ColorIndex++  : ColorIndex=0; 

document.getElementById('safeGuide').className = ColorArray[ColorIndex];
} 


function ChangeColor2(){ 

(ColorIndex < ColorArray2.length-1) ? ColorIndex++  : ColorIndex=0; 

document.getElementById('safeGuide').className = ColorArray2[ColorIndex];

}