var uagent    = navigator.userAgent.toLowerCase();
var is_safari = ( (uagent.indexOf('safari') != -1) || (navigator.vendor == "Apple Computer, Inc.") );
var is_opera  = (uagent.indexOf('opera') != -1);
var is_webtv  = (uagent.indexOf('webtv') != -1);
var is_ie     = ( (uagent.indexOf('msie') != -1) && (!is_opera) && (!is_safari) && (!is_webtv) );
var is_win    =  ( (uagent.indexOf("win") != -1) || (uagent.indexOf("16bit") !=- 1) );
var ua_vers   = parseInt(navigator.appVersion);

// вставка смайлов
function addsmile(code, areaname)
{
	var obj = document.getElementById(areaname);
	code = '' + code + '';

	if (document.selection)
	{
		obj.focus();
		var txtContent = obj.value;
		var str = document.selection.createRange();

		if (str.text == "")
		{
			str.text = code;
		}
		else if(txtContent.indexOf(str.text) != -1)
		{
			str.text = code + str.text;
		}
		else
		{
			obj.value = txtContent + code;
		}
	}
	else
	{
		obj.value = obj.value + code;
	}
}