//
// switch opacity of element passed to this function
// REF:
// http://stackoverflow.com/questions/195951/change-an-elements-css-class-with-javascript
// http://imagecss.com/opacity.html
//
function doOpacityMax(which) 
{ 
    which.className = "opacityMax"; 
}
//
// switch opacity of element passed to this function
//
function doOpacityMin(which) 
{ 
    which.className = "opacityMin"; 
}