var ROLL_IMG_OUT = new Array();
var ROLL_IMG_IN = new Array();

ROLL_IMG_OUT[0] = "images/menu_home.jpg";
ROLL_IMG_IN[0] = "images/menu_in_home.jpg";

ROLL_IMG_OUT[1] = "images/menu_aboutus.jpg";
ROLL_IMG_IN[1] = "images/menu_in_aboutus.jpg";

ROLL_IMG_OUT[2] = "images/menu_projects.jpg";
ROLL_IMG_IN[2] = "images/menu_in_projects.jpg";

ROLL_IMG_OUT[3] = "images/menu_contact.jpg";
ROLL_IMG_IN[3] = "images/menu_in_contact.jpg";



function MM_preloadImages() { 
  var d=document; 
  if(d.images){ 
  	if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; 
	for(i=0; i<a.length; i++)
    	if (a[i].indexOf("#")!=0)
			{ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function on_roll_in(imgname, target) {
  document.getElementById(imgname).src = ROLL_IMG_IN[target];
}
function on_roll_out(imgname, target) {
  document.getElementById(imgname).src = ROLL_IMG_OUT[target];
}