name o id?

[Xinod]

if (ie || ns6) {
document.sec2.src="img/"+s2
document.sec1.src="img/"+s1
document.min2.src="img/"+m2
document.min1.src="img/"+m1
document.hou2.src="img/"+h2
document.hou1.src="img/"+h1
}

diventa
if (ie || ns6) {
document.getElementById('sec2').src="img/"+s2
document.getElementById('sec1').src="img/"+s1
document.getElementById('min2').src="img/"+m2
document.getElementById('min1').src="img/"+m1
document.getElementById('hou2').src="img/"+h2
document.getElementById('hou1').src="img/"+h1
}