if (document.images) {
nav_1_norm = new Image(); nav_1_norm.src = "/img/nav_1_urbanresidential_norm.gif";
nav_2_norm = new Image(); nav_2_norm.src = "/img/nav_2_suburbanresidential_norm.gif";
nav_3_norm = new Image(); nav_3_norm.src = "/img/nav_3_commercial_norm.gif";
nav_4_norm = new Image(); nav_4_norm.src = "/img/nav_4_institutional_norm.gif";
nav_5_norm = new Image(); nav_5_norm.src = "/img/nav_5_principalsstaff_norm.gif";
nav_6_norm = new Image(); nav_6_norm.src = "/img/nav_6_awardspublications_norm.gif";
nav_7_norm = new Image(); nav_7_norm.src = "/img/nav_7_contact_norm.gif";
nav_8_norm = new Image(); nav_8_norm.src = "/img/nav_8_inprogress_norm.gif";

nav_1_roll = new Image(); nav_1_roll.src = "/img/nav_1_urbanresidential_roll.gif";
nav_2_roll = new Image(); nav_2_roll.src = "/img/nav_2_suburbanresidential_roll.gif";
nav_3_roll = new Image(); nav_3_roll.src = "/img/nav_3_commercial_roll.gif";
nav_4_roll = new Image(); nav_4_roll.src = "/img/nav_4_institutional_roll.gif";
nav_5_roll = new Image(); nav_5_roll.src = "/img/nav_5_principalsstaff_roll.gif";
nav_6_roll = new Image(); nav_6_roll.src = "/img/nav_6_awardspublications_roll.gif";
nav_7_roll = new Image(); nav_7_roll.src = "/img/nav_7_contact_roll.gif";
nav_8_roll = new Image(); nav_8_roll.src = "/img/nav_8_inprogress_roll.gif";

nav_1_in = new Image(); nav_1_in.src = "/img/nav_1_urbanresidential_in.gif";
nav_2_in = new Image(); nav_2_in.src = "/img/nav_2_suburbanresidential_in.gif";
nav_3_in = new Image(); nav_3_in.src = "/img/nav_3_commercial_in.gif";
nav_4_in = new Image(); nav_4_in.src = "/img/nav_4_institutional_in.gif";
nav_5_in = new Image(); nav_5_in.src = "/img/nav_5_principalsstaff_in.gif";
nav_6_in = new Image(); nav_6_in.src = "/img/nav_6_awardspublications_in.gif";
nav_7_in = new Image(); nav_7_in.src = "/img/nav_7_contact_in.gif";
nav_8_in = new Image(); nav_8_in.src = "/img/nav_8_inprogress_in.gif";
}

function imgOn(imgName) {
	document[imgName].src = eval(imgName + "_roll.src");
}

function imgOff(imgName) {
	document[imgName].src = eval(imgName + "_norm.src");
}