var foto = new Array();
window.onload = function(){
	if(foto.length > 0)
	{
	    var elementToLoad=document.getElementById('changeImg');

	    var rnd = Math.floor(Math.random()*foto.length);
    	
	    var imgPathLoad=foto[rnd];
	    var imgLoader = document.createElement('img');
	    imgLoader.onload = function(){
		    elementToLoad.src=imgPathLoad;
	    }
	    imgLoader.src=imgPathLoad;
    }
}