var flag_name = true;
									var flag_email = true;
									var flag_website = true;
									var flag_comment = true;
									function clear_name()
									{
									if(flag_name)
									{
									document.getElementById("author").value = '';
									flag_name = false;
									}
									}
									function clear_email()
									{
									if(flag_email)
									{
									document.getElementById("email").value = '';
									flag_email = false;
									}
									}
									function clear_website()
									{
									if(flag_website)
									{
									document.getElementById("website").value = '';
									flag_website = false;
									}
									}
									function clear_comment()
									{
									if(flag_comment)
									{
									document.getElementById("comment").value = '';
									flag_comment = false;
									}
									}

              	function isValid()
              	{if(document.getElementById('author').value.length < 3)
              		{alert('Please make sure the AUTHOR name is at least 3 characters long');return false;}
									var   email   =   document.getElementById('email').value;    
									var   pattern   =   /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+/;    
									flag   =   pattern.test(email);    
									if(!flag)    
									{		    
										alert("input right email address");    
										theform.Email.focus();    
										return   false;    
									}
									if(document.getElementById('comment').value.length < 10)
              		{alert('Please make sure the COMMENT is at least 10 characters long');return false;}
              		return true;}