var image_name = null
if(document.images){

//

g1		= new Image();
g1.src		= "img/homepage.jpg";
g1_over		= new Image();
g1_over.src	= "img/homepage_over.jpg";

// 

g2		= new Image();
g2.src		= "img/partners.jpg";
g2_over		= new Image();
g2_over.src	= "img/partners_over.jpg";

//

g3		= new Image();
g3.src		= "img/contact.jpg";
g3_over		= new Image();
g3_over.src	= "img/contact_over.jpg";

// 

g4		= new Image();
g4.src		= "img/news.jpg";
g4_over		= new Image();
g4_over.src	= "img/news_over.jpg";



}

function change_over(image_name)
{
if (document.images){
if (image_name == "g1") document[image_name].src = g1_over.src ;
if (image_name == "g2") document[image_name].src = g2_over.src ;
if (image_name == "g3") document[image_name].src = g3_over.src ;
if (image_name == "g4") document[image_name].src = g4_over.src ;

}
}

function change_back(image_name)
{
if (document.images){
if (image_name == "g1") document[image_name].src = g1.src ;
if (image_name == "g2") document[image_name].src = g2.src ;
if (image_name == "g3") document[image_name].src = g3.src ;
if (image_name == "g4") document[image_name].src = g4.src ;


}
}