/* Usage - place into form's "onsubmit" handler as follows:
	  onsubmit="this.Email.email = true;
							this.Title.optional = true;
							this.DaysToKeep.numeric = true;
							return verify(this);"
		*** NOTE *** that the title field should be filled in on all fields that will be checked.
		Otherwise Google supplants it with its fill-in message
	*/
// A utility function that returns true if a string contains only whitespace characters.
function isblank(s) {
    for(var i = 0; i < s.length; i++) {
        var c = s.charAt(i);
        if ((c != ' ') && (c != '\n') && (c != '\t')) return false;
    }
    return true;
}

// This is the function that performs form verification. It is invoked
// from the onsubmit event handler. The handler should return whatever
// value this function returns.
function verify(f) {
    var msg;
    var empty_fields = "";
    var errors = "";
	var password1 = "";
	var passwordcount = 0;

    // Loop through the elements of the form, looking for all 
    // text and textarea elements that don't have an "optional" property
    // defined. Then, check for fields that are empty and make a list of them.
    // Also, if any of these elements have a "min" or a "max" property defined,
    // verify that they are numbers and in the right range.
    // If the element has a "numeric" property defined, verify that
    // it is a number, but don't check its range.
    // Put together error messages for fields that are wrong.
    for(var i = 0; i < f.length; i++) {
        var e = f.elements[i];
				isEmpty = ((e.value == null) || (e.value == "") || isblank(e.value));
        if (((e.type == "text") || (e.type == "textarea")) && !e.optional) {
            // first check if the field is empty
            if (isEmpty) {
                empty_fields += "\n          " + ((e.title) ? e.title : e.name);
                continue;
            }
        } // non-optional
				
			// now check for valid e-mail
			if (!isEmpty && (e.email != null)) {
			  if ((e.value.indexOf('@') < 1) || (e.value.indexOf('@') == (e.value.length-1)))
			    errors += "E-mail address not properly formed.\n";
			}
			
			// Now check for fields that are supposed to be numeric.
			if (!isEmpty && (e.numeric || (e.min != null) || (e.max != null))) { 
					var v = parseFloat(e.value);
					if (isNaN(v) || 
							((e.min != null) && (v < e.min)) || 
							((e.max != null) && (v > e.max))) {
							errors += "- The field " + (e.title) ? e.title : e.name + " must be a number";
							if (e.min != null) 
									errors += " that is greater than " + e.min;
							if (e.max != null && e.min != null) 
									errors += " and less than " + e.max;
							else if (e.max != null)
									errors += " that is less than " + e.max;
							errors += ".\n";
					}
			} // numeric
			/*
			// Check for password
			if (reReg)
				pw1Name="Password1"
			else
			  pw1Name="Password0";
	    if (e.type == "password") {
	  	  if (e.name == pw1Name) { // first password - store it
			    passwordcount++;
				password1 = e.value;
		  }
		  else if (e.name == "Password2")				// compare 2nd with first
			  if (e.value != password1) {
			    errors += "'Password' and 'Confirm password' fields should be identical.\n";
			    errors += "'Remember that passwords are case-sensitive.\n";
			  }
		}
			*/

    } // for i
	

    // Now, if there were any errors, display the messages, and
    // return false to prevent the form from being submitted. 
    // Otherwise return true.
    if (!empty_fields && !errors) {
			// form1.Username.disabled = false;		// so we transmit field to server
    	return true;
    }

    msg  = "______________________________________________________\n\n"
    msg += "The form was not submitted because of the following error(s).\n";
    msg += "Please correct these error(s) and re-submit.\n";
    msg += "______________________________________________________\n\n"

    if (empty_fields) {
        msg += "- The following required field(s) are empty:" 
                + empty_fields + "\n";
        if (errors) msg += "\n";
    }
    msg += errors;
    alert(msg);
    return false;
}// verify