function getInternetExplorerVersion(){
	var rv = -1; // Return value assumes failure.
	if (navigator.appName == 'Microsoft Internet Explorer'){
	   var ua = navigator.userAgent;
	   var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
	   if (re.exec(ua) != null)
	      rv = parseFloat( RegExp.$1 );
	}
	return rv;
}
function checkIEVersion()
{
	var msg = "You're not using Windows Internet Explorer.";
	var ver = getInternetExplorerVersion();
	if ( ver> -1 )
	{
	   if ( ver>= 8.0 )
	      msg = "You're using Windows Internet Explorer 8.";
	   else if ( ver == 7.0 ){
			el = document.getElementById('mainTable');
			el.style.marginTop = '50px';
			//el.style.marginLeft = '-79px';		 
	   }	  
	   else if ( ver == 6.0 ){	   
		   el = document.getElementById('mainTable');
			el.style.marginTop = '50px';
			//el.style.marginLeft = '-79px'; 
	   } 
	 }
}