function si_captcha_refresh(img_id,form_id,securimage_url,securimage_show_url){var chars="0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";var string_length=16;var prefix='';for(var i=0;i<string_length;i++){var rnum=Math.floor(Math.random()*chars.length);prefix+=chars.substring(rnum,rnum+1);}
document.getElementById('si_code_'+form_id).value=prefix;var si_image_ctf=securimage_show_url+prefix;if(img_id=='si_image_side_login'){document.getElementById('si_image_side_login').src=si_image_ctf;}else{document.getElementById('si_image_'+form_id).src=si_image_ctf;}}