ns4_compliant=(document.layers&&!document.getElementById)?true:false;ie4_compliant=(document.all&&!document.getElementById)?true:false;ecma_compliant=(document.getElementById)?true:false;function hide_layer(){var a;if(ecma_compliant){a=document.getElementById(hide_layer.arguments[0]);if(a){a.style.visibility="hidden"}}else{if(ns4_compliant){a=document.layers[hide_layer.arguments[0]];if(a){a.visibility="hide"}}else{if(ie4_compliant){a=document.all[hide_layer.arguments[0]];if(a){a.style.visibility="hidden"}}}}}function show_layer(){var a;if(ecma_compliant){a=document.getElementById(show_layer.arguments[0]);if(a){a.style.visibility="visible"}}else{if(ns4_compliant){a=document.layers[show_layer.arguments[0]];if(a){a.visibility="show"}}else{if(ie4_compliant){a=document.all[show_layer.arguments[0]];if(a){a.style.visibility="visible"}}}}};