function change_color_mode(v_c, will_submit) {
	if(v_c=="black") { 
		document.bgColor = 'black';
		document.fgColor = '#e0e0e0';
		document.linkColor = 'yellow';
		document.vlinkColor = 'chocolate';
		document.form.snow_cnt.style.display = 'none';
		flakes_of_snow.style.display = 'none';
		if(will_submit) document.form.submit();
	} else if(v_c=="midnightblue") { 
		document.bgColor = 'midnightblue';
		document.fgColor = 'white';
		document.linkColor = 'yellow';
		document.vlinkColor = 'sandybrown';
		document.form.snow_cnt.style.display = '';
		flakes_of_snow.style.display = '';
		if(will_submit) document.form.submit();
	} else { 
		document.bgColor = 'white';
		document.fgColor = 'darkblue';
		document.linkColor = 'blue';
		document.vlinkColor = 'chocolate';
		document.form.snow_cnt.style.display = 'none';
		flakes_of_snow.style.display = 'none';
		if(will_submit) document.form.submit();
	}
  }