function check(f)
{
  var nameField=f.Name.value;
  var phone=f.Phone.value;
  var emailField=f.email.value;
  
  var commentField=f.Comment.value;
  var al=/^[a-zA-Z_\.\-\" "]+$/;
  var remail=/^[a-zA-Z0-9_\.\-]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$/;
  var regphon= /^\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/;
  
    if(nameField=="" || nameField=="Name:"){
		alert("Please enter your name");
		f.Name.focus();
		return false;
	
    }else if(!al.test(f.Name.value)){
	
		   alert("Name must contain letters of the alphabet only.");
		   f.Name.focus();
		   return false;
	}else if(phone=="" || phone=="Phone:"){
		alert("Please enter phoneno");
		f.Phone.focus();
		return false;
				  
	}else if(emailField==""  || emailField=="e-mail:"){
			alert("Please enter email");
			f.email.focus();
			return false;
	}else if(!remail.test(f.email.value )){
	
		 alert("Please enter your correct eMail address");
		  f.email.focus();
		  return false;
	
	}else if(commentField==""){
		alert("Please give some comment");
		f.Comment.focus();
		return false;
	}else{
	     return true;
	  }
	
}