function changeimages()
{
<!--
var browserName=navigator.appName; 
if (browserName=="Microsoft Internet Explorer")
{ 
// quadrante 1
	
	var img=document.getElementById("quadra1")
	quadra1.style.filter ="progid:DXImageTransform.Microsoft.Fade(duration=2)"
	numcas = Math.floor(imgs1.length*Math.random())
	img.filters[0].apply() //capture initial state of image 
	img.src=imgs1[numcas] //change image to "cat.gif" (though changes not visible yet due to above capture
	img.filters[0].play() //play transition to reveal update 
	
	
/*	numcas = Math.floor(imgs1.length*Math.random())
	document.getElementById("quadra1").filters.RevealTrans.Apply();

	document.getElementById("quadra1").src=imgs1[numcas];
	document.getElementById("quadra1").filters.RevealTrans.Play();*/

	
	//quadrante 2
	var img=document.getElementById("quadra2")
	quadra2.style.filter ="progid:DXImageTransform.Microsoft.Fade(duration=2)"
	numcas = Math.floor(imgs2.length*Math.random())
	img.filters[0].apply() //capture initial state of image 
	img.src=imgs2[numcas] //change image to "cat.gif" (though changes not visible yet due to above capture
	img.filters[0].play() //play transition to reveal update 
	
/*	numcas = Math.floor(imgs2.length*Math.random())
	document.getElementById("quadra2").filters.RevealTrans.Apply();

	document.getElementById("quadra2").src=imgs2[numcas];
	document.getElementById("quadra2").filters.RevealTrans.Play();*/

//quadrante 3
	var img=document.getElementById("quadra3")
	quadra3.style.filter ="progid:DXImageTransform.Microsoft.Fade(duration=2)"
	numcas = Math.floor(imgs3.length*Math.random())
	img.filters[0].apply() //capture initial state of image 
	img.src=imgs3[numcas] //change image to "cat.gif" (though changes not visible yet due to above capture
	img.filters[0].play() //play transition to reveal update 
	
/*	numcas = Math.floor(imgs3.length*Math.random())
	document.getElementById("quadra3").filters.RevealTrans.Apply();

	document.getElementById("quadra3").src=imgs3[numcas];
	document.getElementById("quadra3").filters.RevealTrans.Play();*/
	
	//quadrante 4
	
	var img=document.getElementById("quadra4")
	quadra4.style.filter ="progid:DXImageTransform.Microsoft.Fade(duration=2)"
	numcas = Math.floor(imgs4.length*Math.random())
	img.filters[0].apply() //capture initial state of image 
	img.src=imgs4[numcas] //change image to "cat.gif" (though changes not visible yet due to above capture
	img.filters[0].play() //play transition to reveal update 
	
/*	numcas = Math.floor(imgs4.length*Math.random())
	document.getElementById("quadra4").filters.RevealTrans.Apply();

	document.getElementById("quadra4").src=imgs4[numcas];
	document.getElementById("quadra4").filters.RevealTrans.Play();*/
}
else 
{ 
 // quadrante 1
	
	numcas = Math.floor(imgs1.length*Math.random())
	document.getElementById("quadra1").src=imgs1[numcas];
	//quadrante 2
	numcas = Math.floor(imgs2.length*Math.random())
	document.getElementById("quadra2").src=imgs2[numcas];

//quadrante 3
	numcas = Math.floor(imgs3.length*Math.random())
	document.getElementById("quadra3").src=imgs3[numcas];

	//quadrante 4
	numcas = Math.floor(imgs4.length*Math.random())
	document.getElementById("quadra4").src=imgs4[numcas];
}
//-->

	

	setTimeout("changeimages()",2500);
}