function changecss (sheet, theClass, element, value)
{
	var result = false;
 
	var cssRules;
	if (document.all) cssRules = 'rules';
	else if (document.getElementById) cssRules = 'cssRules';
 
	var ss = -(sheet.length+4)
	var sl = -4;
 
	for (var S = 0; S < document.styleSheets.length; S++)
	{
		if (document.styleSheets[S].href.slice(ss,sl) == sheet)
		{
			var thisRules = document.styleSheets[S][cssRules];
			// loops through styles in sheet to find the correct one.
			for (var R = 0; R < thisRules.length; R++)
			{
				if (thisRules[R].selectorText == theClass)
				{
					thisRules[R].style[element] = value;
					result = true;
				}
			}
			if (sheet != '')
			{
				break;
			}
		}
	}
 
	return result;
}