var newa1='1'
function  change1() {
tabform.hid.value='1'
document.Imagetab1.src='../images/but1o.jpg';
document.Imagetab2.src='../images/but2.jpg';
document.Imagetab3.src='../images/but3.jpg';
document.Imagetab4.src='../images/but4.jpg';
newa1='a'
}
function  change2() {
tabform.hid.value='2'
document.Imagetab1.src='../images/but1.jpg';
document.Imagetab2.src='../images/but2o.jpg';
document.Imagetab3.src='../images/but3.jpg';
document.Imagetab4.src='../images/but4.jpg';
newa1='b'
}
function  change3() {
tabform.hid.value='3'
document.Imagetab1.src='../images/but1.jpg';
document.Imagetab2.src='../images/but2.jpg';
document.Imagetab3.src='../images/but3o.jpg';
document.Imagetab4.src='../images/but4.jpg';
newa1='c'
}
function  change4() {
tabform.hid.value='4'
document.Imagetab1.src='../images/but1.jpg';
document.Imagetab2.src='../images/but2.jpg';
document.Imagetab3.src='../images/but3.jpg';
document.Imagetab4.src='../images/but4o.jpg';
newa1='d'
}

function off1() {
if (newa1=='1') {
document.Imagetab1.src='../images/but1.jpg';
document.Imagetab2.src='../images/but2.jpg';
document.Imagetab3.src='../images/but3.jpg';
document.Imagetab4.src='../images/but4.jpg';
}
if (newa1=='a') {
document.Imagetab1.src='../images/but1o.jpg';
document.Imagetab2.src='../images/but2.jpg';
document.Imagetab3.src='../images/but3.jpg';
document.Imagetab4.src='../images/but4.jpg';
}
if (newa1=='b') {
document.Imagetab1.src='../images/but1.jpg';
document.Imagetab2.src='../images/but2o.jpg';
document.Imagetab3.src='../images/but3.jpg';
document.Imagetab4.src='../images/but4.jpg';
}
if (newa1=='c') {
document.Imagetab1.src='../images/but1.jpg';
document.Imagetab2.src='../images/but2.jpg';
document.Imagetab3.src='../images/but3o.jpg';
document.Imagetab4.src='../images/but4.jpg';
}
if (newa1=='d') {
document.Imagetab1.src='../images/but1.jpg';
document.Imagetab2.src='../images/but2.jpg';
document.Imagetab3.src='../images/but3.jpg';
document.Imagetab4.src='../images/but4o.jpg';
}

}