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// stripslashes    
String.prototype.stripslashes = function(){
    return this.replace(/<.*?>/g, '');
    };
    String.prototype.htmlspecialchars = function(){
    var str = this.replace(/&/g, '&amp;');
    str = str.replace(/</g, '&lt;');
    str = str.replace(/>/g, '&gt;');
    str = str.replace(/"/g, '&quot;');
    return str;
    };

// htmlspecialchars
    var str = '<b>my personal website:</b> ';
    str += '<a href="http://www.jonasjohn.de/">jonasjohn.de</a>';
    document.write("Original string (html): '" + str + "'<br/><br/>");
    var str_no_html = str.stripslashes();
    document.write("- String without HTML tags: '" + str_no_html + "'<br/>");
    var str_hsc = str.htmlspecialchars();
    document.write("- String with converted HTML tags: '" + str_hsc + "'");