function updateDays(f){
	dFrom=f.dayFrom.selectedIndex;
	mFrom=f.monthFrom.selectedIndex;
	yFrom=f.yearFrom.selectedIndex;
	dFrom=dFrom+1;
	mFrom=mFrom+1;
	yFrom=yFrom+1;
	mTo = mFrom;
	yTo = yFrom;
	
	if( dFrom<28 ) {
		dTo = dFrom+1;
	} else if( mFrom == 2 ) {
		dTo = 1;
		mTo = mTo+1;
	} else if( ((mFrom==4) || (mFrom==6) || (mFrom==9) || (mFrom==11)) && (dFrom<30) ) {
		dTo = dFrom+1;
	} else if( ((mFrom==4) || (mFrom==6) || (mFrom==9) || (mFrom==11)) && (dFrom>=30) ) {
		dTo = 1;
		mTo = mTo+1;
	} else if( dFrom<31 ) {
		dTo = dFrom+1;
	} else {
		dTo = 1;
		mTo = mTo+1;
	}
	
	if( mTo > 12 ) {
		mTo = 1;
		yTo = yTo+1;
	}
	
	f.dayTo.selectedIndex = dTo-1;
	f.monthTo.selectedIndex = mTo-1;
	f.yearTo.selectedIndex = yTo-1;
}