/* Décodage base64 et encodage UTF8 (utilisé par la function php "writeEmail") */
function decodeBase64(input){var _keyStr="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";var output="";var chr1,chr2,chr3;var enc1,enc2,enc3,enc4;var i=0;input=input.replace(/[^A-Za-z0-9\+\/\=]/g,"");while(i<input.length){enc1=_keyStr.indexOf(input.charAt(i++));enc2=_keyStr.indexOf(input.charAt(i++));enc3=_keyStr.indexOf(input.charAt(i++));enc4=_keyStr.indexOf(input.charAt(i++));chr1=(enc1<<2)|(enc2>>4);chr2=((enc2&15)<<4)|(enc3>>2);chr3=((enc3&3)<<6)|enc4;output=output+String.fromCharCode(chr1);if(enc3!=64){output=output+String.fromCharCode(chr2);}
if(enc4!=64){output=output+String.fromCharCode(chr3);}}
output=decodeUtf8(output);return output;}
function decodeUtf8(utftext){var string="";var i=0;var c=c1=c2=0;while(i<utftext.length){c=utftext.charCodeAt(i);if(c<128){string+=String.fromCharCode(c);i++;}
else if((c>191)&&(c<224)){c2=utftext.charCodeAt(i+1);string+=String.fromCharCode(((c&31)<<6)|(c2&63));i+=2;}
else{c2=utftext.charCodeAt(i+1);c3=utftext.charCodeAt(i+2);string+=String.fromCharCode(((c&15)<<12)|((c2&63)<<6)|(c3&63));i+=3;}}
return string;}


/* return viewport width */
function getViewportWidth(){var viewportwidth;if(typeof window.innerWidth!='undefined'){viewportwidth=window.innerWidth;}else if(typeof document.documentElement!='undefined'&&typeof document.documentElement.clientWidth!='undefined'&&document.documentElement.clientWidth!=0){viewportwidth=document.documentElement.clientWidth;}else{viewportwidth=document.getElementsByTagName('body')[0].clientWidth;}
return viewportwidth;}


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