function loadMainImage()
{
	var arrImagesNames = new Array();
	arrImagesNames[0] = 'mainpageimage.jpg';
	arrImagesNames[1] = 'imagen1.png';
	arrImagesNames[2] = 'imagen2.png';
	
	var container = document.getElementById('MainPageImage');
	var key = Math.floor( Math.random() * arrImagesNames.length );
	
	container.style.backgroundImage = 'url(/images/mainpage/'+arrImagesNames[ key ]+')';
} // loadMainImage