var whitespace = " \t\n\r";

		function isWhitespace(space) {
		   var i;
   	   // Search through string's characters one by one
	   	// until we find a non-whitespace character.
		   // When we do, return false; if we don't, return true.
   		for (i = 0; i < space.length; i++){   
	       // Check that current character isn't whitespace.
			 // use -1 use as "false" condition of non character, which means it 
			 // it contains character, therefore return false
	         var current = space.charAt(i);
   	      if (whitespace.indexOf(current) == -1) return false;
      	}
	      // All characters are whitespace.
   	   return true;
      }
	

	function chkform (fields){
		 if (isWhitespace(fields.comments.value)) {
			alert ("Please enter your comments.")
			return false
		
			}	
	   if (isWhitespace(fields.fname.value)) {
			alert ("Please enter your first name.")
			return false
		
			}	
			
		 if (isWhitespace(fields.lname.value)) {
			alert ("Please enter your last name.")
			return false
		
			}	
		 if (isWhitespace(fields.email1.value)) {
			alert ("Please enter your email address.")
			return false
		
			}			
		if (!isWhitespace(fields.email1.value)) {
			check_amp = fields.email1.value.indexOf('@',1)
			if (check_amp == -1) {
				alert("Email address is invalid.")
				return false
			} 		
		}	
			
		if (isWhitespace(fields.code.value)) { 
			alert("Please enter the code you see in the image.")
			return false 
		}				
			
	}