function getMainDivStyle(folder)
{

var browser     = '';
var version     = '';
var entrance    = '';
var cond        = '';

if (browser == ''){
if (navigator.appName.indexOf('Microsoft') != -1)
browser = 'IE'
else if (navigator.appName.indexOf('Netscape') != -1)
browser = 'Netscape'
else browser = 'IE';
}
if (version == ''){
version= navigator.appVersion;
paren = version.indexOf('(');
whole_version = navigator.appVersion.substring(0,paren-1);
version         = parseInt(whole_version);
}
if (browser == 'IE') 

	if (version>6)
		document.write('<'+'link rel="stylesheet" href="'+folder+'mainDivIE7.css" />')
	else
		document.write('<'+'link rel="stylesheet" href="'+folder+'mainDivIE.css" />')
else
	document.write('<'+'link rel="stylesheet" href="'+folder+'mainDivOthers.css" />')

}