function changecss(theSelect){
	var cssRules;
	var styleToChange='display';
	var valueOfStyle='block';
	if(document.all){cssRules='rules';}
	else if(document.getElementById){cssRules='cssRules';}
	var cssl=document.styleSheets[1][cssRules].length;
	for (var R=0;R<cssl;R++){
		document.styleSheets[1][cssRules][R].style[styleToChange]='none';
		if (document.styleSheets[1][cssRules][R].selectorText=='.'+theSelect.value)
		{document.styleSheets[1][cssRules][R].style[styleToChange]=valueOfStyle;}}}