if (document.images) {       //if image object is available     

img0on = new Image();  img0on.src = "img/2b_on.jpg"; img0off = new Image(); img0off.src = "img/2b_off.jpg";
img1on = new Image();  img1on.src = "img/4b_on.jpg"; img1off = new Image(); img1off.src = "img/4b_off.jpg";
img2on = new Image();  img2on.src = "img/6b_on.jpg"; img2off = new Image(); img2off.src = "img/6b_off.jpg";
img3on = new Image();  img3on.src = "img/6d_on.jpg"; img3off = new Image(); img3off.src = "img/6d_off.jpg";
img4on = new Image();  img4on.src = "img/8b_on.jpg"; img4off = new Image(); img4off.src = "img/8b_off.jpg";
img5on = new Image();  img5on.src = "img/10b_on.jpg";img5off = new Image(); img5off.src = "img/10b_off.jpg";
img6on = new Image();  img6on.src = "img/12b_on.jpg";img6off = new Image(); img6off.src = "img/12b_off.jpg";
img7on = new Image();  img7on.src = "img/14b_on.jpg";img7off = new Image(); img7off.src = "img/14b_off.jpg";
img8on = new Image();  img8on.src = "img/15b_on.jpg";img8off = new Image(); img8off.src = "img/15b_off.jpg";
img9on = new Image();  img9on.src = "img/ln_on.jpg"; img9off = new Image(); img9off.src = "img/ln_off.jpg";
img10on = new Image(); img10on.src = "img/dl_on.jpg";img10off = new Image();img10off.src = "img/dl_off.jpg";
img11on = new Image(); img11on.src = "img/kg_on.jpg";img11off = new Image();img11off.src = "img/kg_off.jpg";
img12on = new Image(); img12on.src = "img/gl_on.jpg";img12off = new Image();img12off.src = "img/gl_off.jpg";
img13on = new Image(); img13on.src = "img/om_on.jpg";img13off = new Image();img13off.src = "img/om_off.jpg";
img14on = new Image(); img14on.src = "img/kt_on.jpg";img14off = new Image();img14off.src = "img/kt_off.jpg";
img15on = new Image(); img15on.src = "img/fs_on.jpg";img15off = new Image();img15off.src = "img/fs_off.jpg";
img16on = new Image(); img16on.src = "img/dk_on.jpg";img16off = new Image();img16off.src = "img/dk_off.jpg";
img17on = new Image(); img17on.src = "img/zn_on.jpg";img17off = new Image();img17off.src = "img/zn_off.jpg";

}

function imgOn(imgName) {        if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
            }} 
function imgOff(imgName) {        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
            }}
///////////////////////////////////////////////////////////////////////
function rollImg(strImg, strState) {
	document.images[strImg].src = eval(strImg + '_' + strState + '.src;');
}

function preload(imgObj,imgSrc) {
    eval(imgObj + '= new Image()')
    eval(imgObj + '.src = "'+imgSrc+'"')
}