// pre-cache images all the off images
if (document.images) {

	homeOff=new Image;
	homeOff.src='img/nav/nav_home_off.gif';
	
	marineOff=new Image;
	marineOff.src='img/nav/nav_home_marine_off.gif';
    
	industrialOff=new Image;
	industrialOff.src='img/nav/nav_home_industrial_off.gif';
	
	uniqueOff=new Image;
	uniqueOff.src='img/nav/nav_home_unique_off.gif';
	
	aboutOff=new Image;
	aboutOff.src='img/nav/nav_home_about_off.gif';
	
	projectsOff=new Image;
	projectsOff.src='img/nav/nav_home_projects_off.gif';
	
	newsOff=new Image;
	newsOff.src='img/nav/nav_home_news_off.gif';
	
	contactOff=new Image;
	contactOff.src='img/nav/nav_home_contact_off.gif';
	

	// pre-cache images all the on images
	homeOn=new Image;
	homeOn.src='img/nav/nav_home_on.gif';
	
	marineOn=new Image;
	marineOn.src='img/nav/nav_home_marine_on.gif';
    
	industrialOn=new Image;
	industrialOn.src='img/nav/nav_home_industrial_on.gif';
	
	uniqueOn=new Image;
	uniqueOn.src='img/nav/nav_home_unique_on.gif';
	
	aboutOn=new Image;
	aboutOn.src='img/nav/nav_home_about_on.gif';
	
	projectsOn=new Image;
	projectsOn.src='img/nav/nav_home_projects_on.gif';
	
	newsOn=new Image;
	newsOn.src='img/nav/nav_home_news_on.gif';
	
	contactOn=new Image;
	contactOn.src='img/nav/nav_home_contact_on.gif';
	
}
// functions that swap images
function changeImages() {
   if (document.images) {
   		for (var i=0; i<changeImages.arguments.length; i+=2) {
    		document [changeImages.arguments[i]].src = eval (changeImages.arguments[i+1] + ".src");
	
		}
	}
}