function IsURL(str_url){
	var strRegex = "^((https|http|ftp|rtsp|mms)?://)"
	+ "?(([0-9a-z_!~*'().&=+$%-]+: )?[0-9a-z_!~*'().&=+$%-]+@)?" //ftp的user@
	+ "(([0-9]{1,3}\.){3}[0-9]{1,3}" // IP形式的URL- 199.194.52.184
	+ "|" // 允许IP和DOMAIN（域名）
	+ "([0-9a-z_!~*'()-]+\.)*" // 域名- www.
	+ "([0-9a-z][0-9a-z-]{0,61})?[0-9a-z]\." // 二级域名
	+ "[a-z]{2,6})" // first level domain- .com or .museum
	+ "(:[0-9]{1,4})?" // 端口- :80
	+ "((/?)|" // a slash isn't required if there is no file name
	+ "(/[0-9a-z_!~*'().;?:@&=+$,%#-]+)+/?)$";
	var re=new RegExp(strRegex);
	//re.test()
	if (re.test(str_url)){
		return true;
	}else{
		return false;
	}
}