function loading() {
	$("#loading").fadeIn(250); //or document.getElementById("loading").style.display = "block";
}
function loaded() {
	$("#loading").fadeOut(250); //or, you know, display = "none"
}

var delay = (function(){
	  var timer = 0;
	  return function(callback, ms){
	    clearTimeout (timer);
	    timer = setTimeout(callback, ms);
	  };
})();

/**
 * Ajax call with confirmation and div item fade out (option) and optional list view update  
 * @param params list view item ID (a link id) 
 * @param urlCall ajax URL 
 * @param confirmMessage optional confirmation message
 * @returns {Boolean} false on cancel for ajax call
 */
function ajaxLinkCall(params, urlCall, confirmMessage, successMessage )
{
	ret = true;
	if  ( confirmMessage != null && confirmMessage != "" )
		ret = confirm(confirmMessage);
	
	if( ret == true ) {
	$.ajax({
		  url: urlCall,
		  type: 'POST',
		  dataType: 'json',
		  data: params,
		  beforeSend: function( xhr ) {
			loading();  
		  },
		  success: function( data ) {
			if ( data.error === false )
			{
				loaded();
				if ( successMessage != null && successMessage != "" ) alert(successMessage);
			}
			else
				alert(data.ret);			  
		  },
		  error: function (xhr, ajaxOptions, thrownError){
				loaded();
     			//alert(xhr.responseText);
     		 	alert(thrownError);
			}
		});
	}
	return false;

}


/**
 * Ajax call with confirmation and div item fade out (option) and optional list view update  
 * @param params data array sent via ajax 
 * @param urlCall ajax URL 
 * @param confirmMessage optional confirmation message
 * @param fadeOutDiv optional fade out div 
 * @param updateListViewID optional update list view id 
 * @returns {Boolean} false on cancel 
 */
function ajaxLinkCallListViewUpdate(params, urlCall, confirmMessage, fadeOutDiv, updateListViewID )
{
	ret = true;
	if  ( confirmMessage != null && confirmMessage != "" )
		ret = confirm(confirmMessage);
	
	if( ret == true ) {
	$.ajax({
		  url: urlCall,
		  type: 'POST',
		  dataType: 'json',
		  data: params,
		  beforeSend: function( xhr ) {
			loading();  
		  },
		  success: function( data ) {
			if ( data.error === false )
			{
				loaded();
				if ( fadeOutDiv != "" )
				{
					var divID = fadeOutDiv + data.ret;
					if( updateListViewID != "" )
						$(divID).fadeOut(500, function(){$.fn.yiiListView.update(updateListViewID);});
					else
						$(divID).fadeOut(500);
				} else
					if( updateListViewID != "" ) $.fn.yiiListView.update(updateListViewID);
					
			}
			else
				alert(data.ret);			  
		  },
		  error: function (xhr, ajaxOptions, thrownError){
				loaded();
     			//alert(xhr.responseText);
     		 	alert(thrownError);
			}
		});
	}
	return false;

}

/**
 * Ajax call with confirmation and div item fade out (option) and optional list view update  
 * @param params data array sent via ajax 
 * @param urlCall ajax URL 
 * @param confirmMessage optional confirmation message
 * @param fadeOutDiv optional fade out div 
 * @param updateListViewID optional update list view id 
 * @returns {Boolean} false on cancel 
 */
function ajaxLinkCallItemFadeInOutUpdate(params, urlCall, confirmMessage, fadeOutDiv, fadeInDiv )
{
	ret = true;
	if  ( confirmMessage != null && confirmMessage != "" )
		ret = confirm(confirmMessage);
	
	if( ret == true ) {
	$.ajax({
		  url: urlCall,
		  type: 'POST',
		  dataType: 'json',
		  data: params,
		  beforeSend: function( xhr ) {
			loading();  
		  },
		  success: function( data ) {
			if ( data.error === false )
			{
				loaded();
				if ( fadeOutDiv != "" )
				{
					var divID = fadeOutDiv + data.ret;
					if( fadeInDiv != "" )
						$(divID).fadeOut(250, function(){ $(fadeInDiv + data.ret).fadeIn(500); });
					else
						$(divID).fadeOut(500);
				} else
					if( fadeInDiv != "" ) $(fadeInDiv + data.ret).fadeIn(500);
					
			}
			else
				alert(data.ret);			  
		  },
		  error: function (xhr, ajaxOptions, thrownError){
				loaded();
     			//alert(xhr.responseText);
     		 	alert(thrownError);
			}
		});
	}
	return false;

}

/**
 * Ajax call to edit message 
 * @param params list view item ID (a link id) 
 * @param urlCall ajax URL 
 * @returns {Boolean} false on cancel for ajax call
 */
function ajaxEditMessageCall(params, urlCall)
{
    $.ajax({
              url: urlCall,
              type: 'POST',
              dataType: 'json',
              data: params,
              beforeSend: function( xhr ) {
                    loading();  
              },
              success: function( data ) {
                    if ( data.error === false )
                    {
                        loaded();
                        $('#SendMessageForm_message').val(data.message);
                        $('#SendMessageForm_messageID').val(data.ret);
                    }
                    else
                        alert(data.ret);			  
              },
              error: function (xhr, ajaxOptions, thrownError){
                        loaded();
                        //alert(xhr.responseText);
                        alert(thrownError);
                    }
            });
    return false;

}


function insertAtCaret(areaId,text) {
    var txtarea = document.getElementById(areaId);
    var scrollPos = txtarea.scrollTop;
    var strPos = 0;
    var br = ((txtarea.selectionStart || txtarea.selectionStart == '0') ? 
        "ff" : (document.selection ? "ie" : false ) );
    var range;
    if (br == "ie") { 
        txtarea.focus();
        range = document.selection.createRange();
        range.moveStart ('character', -txtarea.value.length);
        strPos = range.text.length;
    }
    else if (br == "ff") strPos = txtarea.selectionStart;

    var front = (txtarea.value).substring(0,strPos);  
    var back = (txtarea.value).substring(strPos,txtarea.value.length); 
    txtarea.value=front+text+back;
    strPos = strPos + text.length;
    if (br == "ie") { 
        txtarea.focus();
        range = document.selection.createRange();
        range.moveStart ('character', -txtarea.value.length);
        range.moveStart ('character', strPos);
        range.moveEnd ('character', 0);
        range.select();
    }
    else if (br == "ff") {
        txtarea.selectionStart = strPos;
        txtarea.selectionEnd = strPos;
        txtarea.focus();
    }
    txtarea.scrollTop = scrollPos;
}