function checkUsernameModule(userName, inputFormID, errorClass, showSelectDialog, isIFrame, callbackOnValidUserName, checkUpperCase)
{
	var position = getIFramePosition(isIFrame);

	if (checkUpperCase == null)
	{
		checkUpperCase = 1;
	}

	checkUpperCase = checkUpperCase?1:0;

	$.trv_postJson({
		errorDailogPosition: position,
		module_name: "check_username",
		ajax_type: "CHECK_USER_NAME",
		parameter: {
			userName: userName,
			checkUpperCase: checkUpperCase
		},
		onSuccess: function(data)
		{
			if (data.userValid == 1)
			{
				$("#"+inputFormID).removeClass(errorClass);
				
				if(callbackOnValidUserName != null && (typeof callbackOnValidUserName == "function"))
				{
					callbackOnValidUserName();
				}
			}
			else if (data.userValid == 0)
			{
				$("#"+inputFormID).addClass(errorClass);
			
				if (showSelectDialog)
				{
					openSelectNewUserNameDialog(userName, inputFormID, errorClass, isIFrame);
				}
			}
		}	
	});
}

function openSelectNewUserNameDialog(userName, inputFormID, errorClass, isIFrame)
{
	if ($("#trv_module_dialog_check_user_name").length == 0)
	{
		blockScreen();
		
		isIFrame = (isIFrame == null || !isIFrame) ? 0:1;
		var position = getIFramePosition(isIFrame);
		
		$("body").append("<div id='trv_module_dialog_check_user_name' style='display:none;'></div>");
		
		$("#trv_module_dialog_check_user_name").load("http://www.it-matchmaker.nl/core/modules/check_username/components/dialog_select_user_name.php?userName="+encodeURI(userName)+"&inputFormID="+encodeURI(inputFormID)+"&errorClass="+encodeURI(errorClass)+"&full_path=NVkzNENoeWMoUmQ1aGFGPUYzd0ZzdUE7LCgvKD4xekhkZTVDK0ZzRWhiNVdtQjA8PkMqZEI_KyA7JXA7PjN5VHomcUVXW1daUG8sM2Fjbn0,&app_language=nl&amp;PHPSESSID=e5a1312510038e3f5730460e6c0ac643").dialog({
	    	close: function(event, ui) 
	 		{ 
	 			$(this).dialog('destroy');
	 			$("#trv_module_dialog_check_user_name").remove();
	 			$("#"+inputFormID).focus();
	 			$("#"+inputFormID).select();
	 		},
			closeOnEscape: true,
	    	resizable: false,
	    	position: position,
	    	minHeight: 300,
	    	height: 'auto',
	    	width: 400,
	    	modal: true,
	    	bgiframe: true,
	    	title: "Selecteren van een andere gebruikersnaam"   
		});
	}
}