The onmouseover event handler is used for generating various kinds of interactivity on web pages. It’s most often used for image rollovers. Image change on mouse over is actually quite simple once we understand the logic.
Here are the two images I made:
icon1.gif: Image for Mouse Out
icon2.gif: Image for Mouse Over
We’ll now construct an image tag and give the image a name using its NAME attribute.
<IMG SRC="icon1.gif" NAME="but" WIDTH="100" HEIGHT="50" BORDER="0" ALT="...">
We use icon1.gif as the value for the SRC attribute since this is the image used for mouseout. The image is named but.
The two event handlers are placed inside the starting <A> tag.
<A HREF="some.html" onmouseover="document.but.src='icon2.gif'" onmouseout="document.but.src='icon1.gif'"> <IMG SRC="icon1.gif" NAME="but" WIDTH="100" HEIGHT="50" BORDER="0" ALT="..."> </A>
As you would have guessed, images are a part the document object. The src property of the image object determines the source of the image.
The popular Sudoku involves no mathematics at all. Instead of numbers, shapes, alphabet, colors, symbols etc. can be used. That's the beauty and simplicity of the puzzle! By the way, only 5,472,730,538 Sudoku are solvable. That's a big enough number in itself! Contrary to popular belief stemming probably from it's Japanese sounding name, Sudoku did not originate in Japan! It was created by an American Architect, Howard Garns, who called it Number Place - the Japanese still call it that. On a related note, the credit for popularising Sudoku goes to Wayne Gould, a Hong Kong judge. He spent several years in developing a computer program that would automatically generate these puzzles. Gould also convinced The Times in Britain to publish them. From there, Sudoku quickly reached US shores and spread around the world. [more...]