function isValidEmail(str) {
   return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
 
}
function isValidURL(url) { 
    var v = new RegExp(); 
    v.compile("^[A-Za-z]+://[A-Za-z0-9-_]+\\.[A-Za-z0-9-_%&\?\/.=]+$"); 
    if (!v.test(url)) { 
        return false; 
    } else {
		return true;
	}
}
function validate_login() {
	var obj = document.login;
	if(obj.username.value == '') {
		alert('Please enter username.');
		obj.username.focus();
		return false;
	}
	if(obj.password.value == '') {
		alert('Please enter password.');
		obj.password.focus();
		return false;
	}
	return true;
}
function IsNumeric(sText) {
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;
 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
}
function validate_admin() {
	var obj = document.admin;
	if(obj.username.value == '') {
		alert('Please enter username.');
		obj.username.focus();
		return false;
	}
	if(obj.password.value == '') {
		alert('Please enter password.');
		obj.password.focus();
		return false;
	}
	if(obj.confirm_password.value == '') {
		alert('Please enter confirm password.');
		obj.confirm_password.focus();
		return false;
	}
	if(obj.password.value != obj.confirm_password.value) {
		alert('Passwords do not match.');
		obj.password.value = '';
		obj.confirm_password.value = '';
		obj.password.focus();
		return false;
	}
	return true;
}
function validate_page() {
	var obj = document.page;
	if(obj.title.value == '') {
		alert('Please enter title.');
		obj.title.focus();
		return false;
	}
	return true;
}