function changeLayer(c,e){var a,b,d;a=(document.layers)?1:0;b=(document.all)?1:0;d=(document.getElementById)?1:0;if(a){document.layers[c].visibility=e?"show":"hide"}else{if(d){document.getElementById(c).style.visibility=e?"visible":"hidden"}else{document.all[c].style.visibility=e?"visible":"hidden"}}};