show = 1500;
hide = 500;
NameOfYourTags="advert_perex";

swi=1;
na1=document.getElementsByName(NameOfYourTags);
na2=document.all.tags("blink");

bringBackBlinky();

function bringBackBlinky() {
	if (swi == 1) {
		sho="visible";
		swi=0;
	} else {
		sho="hidden";
		swi=1;
	}
	
	for(i=0;i<na1.length;i++) {
		na1[i].style.visibility=sho;
	}
	
	for(i=0;i<na2.length;i++) {
		na2[i].style.visibility=sho;
	}
	
	
	if (swi == 1) {
		setTimeout("bringBackBlinky()", hide);
	} else {
		setTimeout("bringBackBlinky()", show);
	}
}