function doPlanToggle(){
resetStatusbar();
var current_o = service_IMRO2008.opacity; // load current setting
var new_o;
switch (current_o) {
case 0.00: new_o = 0.25; break;
case 0.25: new_o = 0.50; break;
case 0.50: new_o = 0.75; break;
case 0.75: new_o = 1.00; break;
case 1.00: new_o = 0.00; break;
default: new_o = 0.50;
}
service_IMRO2008.setOpacity(new_o);
setStatusbar("Dekkingspercentage plan aangepast in: " + parseInt(100 * new_o) + "%"); // interface feedback
} // WvI 2010-08-02