(new Image()).src = "img/6.jpg";
(new Image()).src = "img/7.jpg";
(new Image()).src = "img/8.jpg";
(new Image()).src = "img/9.jpg";
(new Image()).src = "img/10.jpg";

 
window.onload = function()
{
document.picture1.onmouseover = function(){ document.picture1.src="img/6.jpg"; }
document.picture1.onmouseout = function() { document.picture1.src="img/1.jpg"; }
document.picture2.onmouseover = function(){ document.picture2.src="img/7.jpg"; }
document.picture2.onmouseout = function() { document.picture2.src="img/2.jpg"; }
document.picture4.onmouseover = function(){ document.picture4.src="img/9.jpg"; }
document.picture4.onmouseout = function() { document.picture4.src="img/4.jpg"; }
document.picture5.onmouseover = function(){ document.picture5.src="img/10.jpg"; }
document.picture5.onmouseout = function() { document.picture5.src="img/5.jpg"; }
}