Leonardo Da Vinci one of the greatest artists pertold in history. He created several tremendous and infamous art pieces including The Mona Lisa. This was only one of his several extradinary works.

Leonardo Da Vinci one of the greatest artists pertold in history. He created several tremendous and infamous art pieces including The Mona Lisa. This was only one of his several extradinary works. Leonardo Da Vinci was born in 1452 on his father's estate in Vinci, Italy. He received his education on the estate until the age of fifteen. Which is when his father had noticed Leonardo's potential and had decided to send him to be an apprentice to the artist Andrea del Verrocchio in Florence. There he studied sculpture and the mechanical arts. This was also when he first developed an interest in anatomy. In 1472 Leonardo was accepted into the painters' guild at Florence, where he remained for the next ten years. In 1482, Leonardo was hired by the duke of Milan, Ludovico Sforza, to be artist and engineer in residence. During his stay in Milan, he started to compose a unified theory of the world and to illustrate it in a series of voluminous notebooks. Unfortunately due to his pursuit of scientific knowledge he had to leave many of his artistic creations unfinished.Vitruvian Man by Leonardo da Vinci, Galleria dell'...He stayed in Milan for seventeen years. There he completed six pain tings: two portraits of the 'Last Supper', two versions of 'The Virgin of the Rocks', and a decorative ceiling painting in the Castello Sforzesco. Other paintings were either unfinished or have disappeared. In the early 1500's, Leonardo returned to his home city. In Florence, he was commissioned to do a number of paintings, but other interests and tasks kept him from finishing them. The most well known piece to survive from this time period was the famous "Mona Lisa", which is now in the Louvre in Paris. For ten months during 1502, Leonardo served as military adviser and engineer. During the years 1513 to 1516, Leonardo was in Rome at the invitation of Cardinal Giuliano de' Medici, brother of Pope Leo X. Some of the greatest artists of the time were at work in Rome for...

Why You Should Use JavaScript on Your Site

Why You Should Use JavaScript on Your Site Not everyone has JavaScript available in their web browser and a number of those who are using browsers where it is available have it turned off. It is therefore necessary that your web page be able to function properly for those people without using any JavaScript at all. Why then would you want to add JavaScript to a web page that already works without it? Reasons Why You May Want to Use JavaScript There are several reasons for why you may want to use JavaScript on your web page even though the page is usable without the JavaScript. Most of the reasons relate to providing a friendlier experience for those of your visitors who do have JavaScript enabled. Here are a few examples of proper use of JavaScript to improve your visitors experience. JavaScript Is Great for Forms Where you have forms on your web page that your visitor needs to fill out that form content will need to be validated before it can be processed. You will, of course, have server-side validation that validates the form after it is submitted and which reloads the form highlighting the errors if anything invalid has been entered or mandatory fields are missing. That requires a round trip to the server when the form is submitted to perform the validation and report the errors. We can speed up that process significantly by duplicating that validation using JavaScript and by attaching much of the JavaScript validation to the individual fields. That way the person filling out the form who has JavaScript enabled has immediate feedback if what they enter into a field is invalid instead of their filling out the whole form and submitting it and then having to wait for the next page to load to give them feedback. The form works both with and without JavaScript and provides more immediate feedba ck when it can. A Slideshow A slideshow consists of a number of images. In order for the slideshow to function without JavaScript the next and previous buttons that work the slideshow need to reload the entire web page substituting the new image. This will work but will be slow, particularly if the slideshow is only one small part of the page. We can use JavaScript to load and replace the images in the slideshow without needing to reload the rest of the web page and so make the slideshow operation much faster for those of our visitors with JavaScript enabled. A Suckerfish Menu A suckerfish menu can operate entirely without JavaScript (except in IE6). The menus will open when the mouse hovers over them and close when the mouse is removed. Such opening and closing will be instant with the menu just appearing and disappearing. By adding some JavaScript we can have the menu appear to scroll out when the mouse moves over it and scroll back in when the mouse moves off of it giving a nicer appearance to the menu without affecting the way the menu works. JavaScript Enhances Your Web page In all appropriate uses of JavaScript, the purpose of the JavaScript is to enhance the way the web page works and to provide those of your visitors who have JavaScript enabled with a friendlier site than is possible without the JavaScript. By using JavaScript in an appropriate way you encourage those who have a choice as to whether they will allow the JavaScript to run or not to actually have it turned on for your site. Remember that a number of those who do have a choice and who have chosen to turn JavaScript off have done so due to the way in which some sites completely misuse javaScript so as to make their visitors experience of their site worse rather than better. Dont you be one of those using JavaScript inappropriately and therefore encouraging people to turn off JavaScript.