function ImgObject(imgname) {
	this.nml = new Image();
	this.nml.src = "img/"+imgname+".gif";
	this.ovr = new Image();
	this.ovr.src = "img/"+imgname+"_ovr.gif";
}

var arrImg = new Array();

arrImg[0] = new ImgObject("nav_signup");
arrImg[1] = new ImgObject("nav_serviceplans");
arrImg[2] = new ImgObject("nav_referafriend");
arrImg[3] = new ImgObject("nav_faq");
arrImg[4] = new ImgObject("nav_partnershipadv");
arrImg[5] = new ImgObject("nav_howitworks");
arrImg[6] = new ImgObject("nav_contactus");
arrImg[7] = new ImgObject("nav_home");