if (document.images) {

	nav_1_norm = new Image(); nav_1_norm.src = "img/4b-compression.jpg";
	nav_1_roll = new Image(); nav_1_roll.src = "img/4b-compression-glow.jpg";
	nav_2_norm = new Image(); nav_2_norm.src = "img/4b-extension.jpg";
	nav_2_roll = new Image(); nav_2_roll.src = "img/4b-extension-glow.jpg";
	nav_3_norm = new Image(); nav_3_norm.src = "img/4b-torsion.jpg";
	nav_3_roll = new Image(); nav_3_roll.src = "img/4b-torsion-glow.jpg";
	nav_0_norm = new Image(); nav_0_norm.src = "img/4b-specialty.jpg";
	nav_0_roll = new Image(); nav_0_roll.src = "img/4b-specialty-glow.jpg";

	nav_4_norm = new Image(); nav_4_norm.src = "img/sidenav-compression.jpg";
	nav_4_roll = new Image(); nav_4_roll.src = "img/sidenav-compression-over.jpg";
	nav_5_norm = new Image(); nav_5_norm.src = "img/sidenav-extension.jpg";
	nav_5_roll = new Image(); nav_5_roll.src = "img/sidenav-extension-over.jpg";
	nav_6_norm = new Image(); nav_6_norm.src = "img/sidenav-torsion.jpg";
	nav_6_roll = new Image(); nav_6_roll.src = "img/sidenav-torsion-over.jpg";
	
	nav_7_norm = new Image(); nav_7_norm.src = "img/nav_7_back_norm.jpg";
	nav_7_roll = new Image(); nav_7_roll.src = "img/nav_7_back_roll.jpg";
	nav_8_norm = new Image(); nav_8_norm.src = "img/nav_8_next_norm.jpg";
	nav_8_roll = new Image(); nav_8_roll.src = "img/nav_8_next_roll.jpg";
	nav_10_norm = new Image(); nav_10_norm.src="img/sidenav-specialty.jpg";
	nav_10_roll = new Image(); nav_10_roll.src="img/sidenav-specialty-over.jpg";
	nav_11_norm = new Image(); nav_11_norm.src = "img/mx_backPage.gif";
	nav_11_roll = new Image(); nav_11_roll.src = "img/mx_backPage_on.gif";
	nav_12_norm = new Image(); nav_12_norm.src = "img/mx_nextPage.gif";
	nav_12_roll = new Image(); nav_12_roll.src = "img/mx_nextPage_on.gif";
	
	nav_14_norm = new Image(); nav_14_norm.src = "img/mx_sidenav-compression.jpg";
	nav_14_roll = new Image(); nav_14_roll.src = "img/mx_sidenav-compression-over.jpg";
	nav_15_norm = new Image(); nav_15_norm.src = "img/mx_sidenav-extension.jpg";
	nav_15_roll = new Image(); nav_15_roll.src = "img/mx_sidenav-extension-over.jpg";
	nav_16_norm = new Image(); nav_16_norm.src = "img/mx_sidenav-torsion.jpg";
	nav_16_roll = new Image(); nav_16_roll.src = "img/mx_sidenav-torsion-over.jpg";
	nav_17_norm = new Image(); nav_17_norm.src="img/mx_sidenav-specialty.jpg";
	nav_17_roll = new Image(); nav_17_roll.src="img/mx_sidenav-specialty-over.jpg";

	nav_18_norm = new Image(); nav_18_norm.src = "img/mx_compression.jpg";
	nav_18_roll = new Image(); nav_18_roll.src = "img/mx_compression-over.jpg";
	nav_19_norm = new Image(); nav_19_norm.src = "img/mx_extension.jpg";
	nav_19_roll = new Image(); nav_19_roll.src = "img/mx_extension-over.jpg";
	nav_20_norm = new Image(); nav_20_norm.src = "img/mx_torsion.jpg";
	nav_20_roll = new Image(); nav_20_roll.src = "img/mx_torsion-over.jpg";
	nav_21_norm = new Image(); nav_21_norm.src=  "img/mx_specialty.jpg";
	nav_21_roll = new Image(); nav_21_roll.src=  "img/mx_specialty-over.jpg";
	
	
	tnav_1_norm = new Image(); tnav_1_norm.src = "img/topnav_compression.jpg";
	tnav_1_roll = new Image(); tnav_1_roll.src = "img/topnav_compression-over.jpg";
	tnav_2_norm = new Image(); tnav_2_norm.src = "img/topnav_extension.jpg";
	tnav_2_roll = new Image(); tnav_2_roll.src = "img/topnav_extension-over.jpg";
	tnav_3_norm = new Image(); tnav_3_norm.src = "img/topnav_torsion.jpg";
	tnav_3_roll = new Image(); tnav_3_roll.src = "img/topnav_torsion-over.jpg";
	tnav_4_norm = new Image(); tnav_4_norm.src = "img/topnav_specialty.jpg";
	tnav_4_roll = new Image(); tnav_4_roll.src = "img/topnav_specialty-over.jpg";

	tnav_5_norm = nav_14_norm;  //new Image(); tnav_5_norm.src = "img/mx_sidenav-compression.jpg";
	tnav_5_roll = nav_14_roll;  //new Image(); tnav_5_roll.src = "img/mx_sidenav-compression-over.jpg";
	tnav_6_norm = nav_15_norm;  //new Image(); tnav_6_norm.src = "img/mx_sidenav-extension.jpg";
	tnav_6_roll = nav_15_roll;  //new Image(); tnav_6_roll.src = "img/mx_sidenav-extension-over.jpg";
	tnav_7_norm = nav_16_norm;  //new Image(); tnav_7_norm.src = "img/mx_sidenav-torsion.jpg";
	tnav_7_roll = nav_16_roll;  //new Image(); tnav_7_roll.src = "img/mx_sidenav-torsion-over.jpg";
	tnav_8_norm = nav_17_norm;  //new Image(); tnav_8_norm.src = "img/mx_sidenav-specialty.jpg";
	tnav_8_roll = nav_17_roll;  //new Image(); tnav_8_roll.src = "img/mx_sidenav-specialty-over.jpg";
}
function imgOn(imgName) {
document[imgName].src = eval(imgName + "_roll.src");
}
function imgOff(imgName) {
document[imgName].src = eval(imgName + "_norm.src");
}
//function imgOffIn(imgName) {
//document[imgName].src = eval(imgName + "_in.src");
//}