function str_strip(a){return str_trim(a)}function str_trim(a){return a.replace(/^\s+|\s+$/g,"")}function str_ltrim(a){return a.replace(/^\s+/,"")}function str_rtrim(a){return a.replace(/\s+$/,"")}function str_isdigit(a){return(a.toString().search(/^[0-9]+$/)==0)}function str_startswith(c,b,a){if(!a){a=true}var d=c.substring(0,b.length);if(a){d=d.toLowerCase();b=b.toLowerCase()}return(d==b)};