function csere() {
	for(i=0;i<document.links.length;i++) {
		document.links[i].href=document.links[i].href.replace(/\[kukac\]/gi,"@");
	}
	document.body.innerHTML=document.body.innerHTML.replace(/([^-+_a-z0-9\.]*)([-+_a-z0-9\.]+)(\[kukac\])([-+_a-z0-9\.]+)([^-+_a-z0-9\.]*)/gi,"$1<a href=\"mailto:$2@$4\">$2@$4</a>$5");
}