restrict words to input field jquery

Make user cannot write certain words in text field jquery

$("#UserContactmeForm").submit(function(e){
					e.preventDefault();
					var mess = $("#message").val();
					var out;
					if(mess.indexOf("@")  >= 0)
					{
						out+= "@";
										
					}
					if(mess.indexOf("skype")  >= 0)
					{
						out+= ",skype";
										
					}
					if(mess.indexOf("e-mail")  >= 0)
					{
						out+= ",e-mail";
										
					}
								
				 if(out)
					{
						alert("You cannot use these words  "+out);
					}
				if(out="" || !out)
					{
										$("form").submit();
					}
		});
							
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