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JavaScript - Pantalla en blanco y negro.

/ Published in: PHP
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Copy this code and paste it in your HTML 
  1. function alertar()
  2. {
  3. 	ht = document.getElementsByTagName('html');
  4. 	ht[0].style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(grayscale=1)';
  5. 	if (confirm('¿Aca la pregunta?'))
  6. 	{
  7. 		return true;
  8. 	}
  9. 	else
  10. 	{
  11. 		ht[0].style.filter = '';
  12. 		return false;
  13. 	}
  14. }
  15. //llamar usando un return delante, ej: onclick='return alertar()'

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