function mSetDivHeight() {
 var main_center = document.getElementById('main_center_part');
 var main_right  = document.getElementById('main_right_part');

 iRcH = main_center.offsetHeight;
 iPrH = main_right.offsetHeight;

 if ( iRcH < iPrH) {
   main_center.style.height = (iPrH) + 'px';
 } else {
   main_right.style.height = (iRcH) + 'px';
 }

 return false;
}