function CheckTab() {
	if (TabNum==1) {
		MM_swapImage('A','','img/english_01_over.gif',0);
		MM_swapImage('B','','img/english_02_out.gif',0);
		MM_swapImage('C','','img/english_03_out.gif',0);
		MM_swapImage('D','','img/english_04_out.gif',0);
		
	} else if (TabNum==2){
		MM_swapImage('A','','img/english_01_out.gif',0);
		MM_swapImage('B','','img/english_02_over.gif',0);
		MM_swapImage('C','','img/english_03_out.gif',0);
		MM_swapImage('D','','img/english_04_out.gif',0);
		
  } else if (TabNum==3){
		MM_swapImage('A','','img/english_01_out.gif',0);
		MM_swapImage('B','','img/english_02_out.gif',0);
		MM_swapImage('C','','img/english_03_over.gif',0);
		MM_swapImage('D','','img/english_04_out.gif',0);
		
  } else {
		MM_swapImage('A','','img/english_01_out.gif',0);
		MM_swapImage('B','','img/english_02_out.gif',0);
		MM_swapImage('C','','img/english_03_out.gif',0);
		MM_swapImage('D','','img/english_04_over.gif',0);
  }
}