if (document.images) {

sec1_bw = new Image(); 
sec1_bw.src = "images/sec1.jpg";
sec1 = new Image();
sec1.src = "images/sec1.jpg";

sec2_bw = new Image(); 
sec2_bw.src = "images/sec2.jpg";
sec2 = new Image();
sec2.src = "images/sec2.jpg";

sc1_bw = new Image(); 
sc1_bw.src = "images/sc1.jpg";
sc1 = new Image();
sc1.src = "images/sc1.jpg";

sc2_bw = new Image(); 
sc2_bw.src = "images/sc2.jpg";
sc2 = new Image();
sc2.src = "images/sc2.jpg";

sc3_bw = new Image(); 
sc3_bw.src = "images/sc3.jpg";
sc3 = new Image();
sc3.src = "images/sc3.jpg";

sc4_bw = new Image(); 
sc4_bw.src = "images/sc4.jpg";
sc4 = new Image();
sc4.src = "images/sc4.jpg";

sc5_bw = new Image(); 
sc5_bw.src = "images/sc5.jpg";
sc5 = new Image();
sc5.src = "images/sc5.jpg";

sc6_bw = new Image(); 
sc6_bw.src = "images/sc6.jpg";
sc6 = new Image();
sc6.src = "images/sc6.jpg";

sc7_bw = new Image(); 
sc7_bw.src = "images/sc7.jpg";
sc7 = new Image();
sc7.src = "images/sc7.jpg";

}

function imgOn(imgName) {

if (document.images) {
document[imgName].src = eval(imgName + ".src");
}
}

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

function NewWindow(mypage, myname, w, h, scroll) {
 var winl = (screen.width - w) / 2;
 var wint = (screen.height - h) / 2;
 winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable'
 win = window.open(mypage, myname, winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}