if (document.getElementsByTagName) {

var pics = document.getElementsByTagName('img');

for (var i=0;i<pics.length;++i) {

var sou = pics[i].src.split('/');

for (j=0;j<sou.length;j++) {

if (sou[j] == 'printctr_but.gif') {

pics[i].parentNode.style.display = 'none';
}
}
}
}