// Generates an unique identifier.
function GetUploadId()
{
	var uniqueIDBegin = Math.round(Math.random() * 100000);	
		
	var uniqueIDEnd = (new Date).getTime() % 10000000000;	
	
	return uniqueIDBegin.toString() + uniqueIDEnd.toString();
}

// Creates a new window with specified URL and size.
function CreateProgressWindow(progressPage, UploadId, width, height)
{
	var offsetX = (screen.width - width) / 2;
	var offsetY = (screen.height - height) / 2;
	
	var windowFeatures = "resizable=yes,width=" + width + ",height=" + height + ",left=" + offsetX + ",top=" + offsetY;
	
	// Add an UploadId field to queri string. 
	// We use a value of "UploadId" parameter that is specified in 
	// <EasyAlgo.EAUpload>/<Environment> section of the web.config file 
	// for defining a name of query string parameter. In our case it is "UploadId".	
	if(progressPage.indexOf("?")==-1)
		progressPage += '?UploadId=' + UploadId;
	else
		progressPage += '&UploadId=' + UploadId;
	
	return window.open(progressPage, "progressWindow_" + UploadId, windowFeatures);
}

// Refreshes query string and adds an unique identifier.
function RefreshQueryString(formAction, UploadId)
{
	// Check entry multiple parameters into query string.
	if(formAction.indexOf("?")==-1)
	{
		formAction += "?UploadId=" + UploadId;
	}
	else
	{
		// Replase old UploadId value for second and next uploads.
		if (formAction.indexOf("UploadId")!=-1)
		{													
			var parameterPosition = formAction.indexOf("UploadId");
			
			if (formAction.indexOf("&", parameterPosition)==-1)
			{
				formAction = formAction.slice(0, parameterPosition + "UploadId=".length) + UploadId;
			}
			else
			{
				var andSymPosition = formAction.indexOf("&", parameterPosition);
				
				formAction = formAction.slice(0, parameterPosition + "UploadId=".length) + UploadId + formAction.slice(andSymPosition);
			}
		}
		else
		{
			formAction += '&UploadId=' + UploadId;
		}
	}
	
	return formAction;
}

function IsStopCommandSupported()
{
	if (window.stop || window.document.execCommand)
	{
		return true;
	}
	else
	{
		return false;
	}

}

function JSONtoJSObject(jsonString)
{
	jsonString = jsonString.replace(/\n|\r/g, "");
	
	return eval("(" + jsonString + ")");	
}