preloaded = false;

window.onload = function preloadImages() {
	if (document.images) {
	
		home_on       		= new Image();
		home_on.src   		= "images/nav_circle_on.gif";
		home_off     		= new Image();
		home_off.src 		= "images/nav_circle_off.gif";

		aboutus_on       	= new Image();
		aboutus_on.src   	= "images/nav_circle_on.gif";
		aboutus_off     	= new Image();
		aboutus_off.src 	= "images/nav_circle_off.gif";

		people_on       	= new Image();
		people_on.src   	= "images/nav_circle_on.gif";
		people_off     		= new Image();
		people_off.src 		= "images/nav_circle_off.gif";

		economic_on       	= new Image();
		economic_on.src		= "images/nav_circle_on.gif";
		economic_off     	= new Image();
		economic_off.src 	= "images/nav_circle_off.gif";
		
		community_on       	= new Image();
		community_on.src   	= "images/nav_circle_on.gif";
		community_off     	= new Image();
		community_off.src 	= "images/nav_circle_off.gif";
		
		regen_on       		= new Image();
		regen_on.src   		= "images/nav_circle_on.gif";
		regen_off     		= new Image();
		regen_off.src 		= "images/nav_circle_off.gif";

		news_on       		= new Image();
		news_on.src   		= "images/nav_circle_on.gif";
		news_off     		= new Image();
		news_off.src 		= "images/nav_circle_off.gif";
		
		careers_on       	= new Image();
		careers_on.src   	= "images/nav_circle_on.gif";
		careers_off     	= new Image();
		careers_off.src 	= "images/nav_circle_off.gif";
		
		contactus_on       	= new Image();
		contactus_on.src   	= "images/nav_circle_on.gif";
		contactus_off     	= new Image();
		contactus_off.src	= "images/nav_circle_off.gif";

	}
	preloaded = true
}

function buttonon(buttonname) { 
	if ((document.images)&&(preloaded)) {
		document[ buttonname ].src = eval( buttonname + "_on.src" );
	}
}
function buttonoff(buttonname) {
	if ((document.images)&&(preloaded)) {
		document[ buttonname ].src = eval( buttonname + "_off.src" );
	}
}


function change(id, newClass) {
identity=document.getElementById(id);
identity.className=newClass;
}