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<head> <script> var whichSquareIsRed = 2; function hover(element, i) { if (whichSquareIsRed == i) { element.setAttribute('src', 'https://via.placeholder.com/100/FF0000'); } else { element.setAttribute('src', 'https://via.placeholder.com/100/00FF00'); } } function unhover(element, i) { if (whichSquareIsRed == i) { element.setAttribute('src', 'https://via.placeholder.com/100/AA0000'); } else { element.setAttribute('src', 'https://via.placeholder.com/100/00AA00'); } } </script> </head> <img src="https://via.placeholder.com/100/00AA00" onmouseover="hover(this, 1);" onmouseout="unhover(this, 1);" /> <img src="https://via.placeholder.com/100/AA0000" onmouseover="hover(this, 2);" onmouseout="unhover(this, 2);" /> <img src="https://via.placeholder.com/100/00AA00" onmouseover="hover(this, 3);" onmouseout="unhover(this, 3);" /> <img src="https://via.placeholder.com/100/00AA00" onmouseover="hover(this, 4);" onmouseout="unhover(this, 4);" />