// css.js

function get_css(rule_name,stylesheet,delete_flag){if(!document.styleSheets)return false;rule_name=rule_name.toLowerCase();stylesheet=stylesheet||0;for(var i=stylesheet;i<document.styleSheets.length;i++){var styleSheet=document.styleSheets[i];css_rules=document.styleSheets[i].cssRules||document.styleSheets[i].rules;if(!css_rules)continue;var j=0;do{if(css_rules.length&&j>css_rules.length+5)return false;if(css_rules[j].selectorText&&css_rules[j].selectorText.toLowerCase()==rule_name){if(delete_flag==true){if(document.styleSheets[i].removeRule)document.styleSheets[i].removeRule(j);if(document.styleSheets[i].deleteRule)document.styleSheets[i].deleteRule(j);return true}else return css_rules[j]}}while(css_rules[++j])}return false}function add_css(rule_name,stylesheet){rule_name=rule_name.toLowerCase();stylesheet=stylesheet||0;if(!document.styleSheets||get_css(rule_name,stylesheet))return false;(document.styleSheets[stylesheet].insertRule)?document.styleSheets[stylesheet].insertRule(rule_name+' { }',0):document.styleSheets[stylesheet].addRule(rule_name,null,0);return get_css(rule_name,stylesheet)}function get_sheet_num(href_name){if(!document.styleSheets)return false;for(var i=0;i<document.styleSheets.length;i++){if(document.styleSheets[i].href&&document.styleSheets[i].href.toString().match(href_name))return i}return false}function remove_css(rule_name,stylesheet){return get_css(rule_name,stylesheet,true)}function add_sheet(url,media){if(document.createStyleSheet){document.createStyleSheet(url)}else{var newSS=document.createElement('link');newSS.rel='stylesheet';newSS.type='text/css';newSS.media=media||"all";newSS.href=url;document.getElementsByTagName("head")[0].appendChild(newSS)}}