function aclara(id,opa,num,inter){
		var obj = document.getElementById(id);
		obj.style.opacity = opa * 0.01;
		obj.style.MozOpacity = opa * 0.01;
		obj.style.KhtmlOpacity = opa * 0.01;
		obj.style.filter = "alpha(opacity=" + opa + ")";
		opa = opa + num;
		if(opa <= 100)
			setTimeout("aclara('" + id + "'," + opa + "," + num +")",inter);
		else
			return 1;
	}

	function degrada(id,opa,num,inter){
		var obj = document.getElementById(id);
		var x;
		obj.style.opacity = opa * 0.01;
		obj.style.MozOpacity = opa * 0.01;
		obj.style.KhtmlOpacity = opa * 0.01;
		obj.style.filter = "alpha(opacity=" + opa + ")";
		opa = opa - num;
		if(opa >= 0){
			setTimeout("degrada('" + id + "'," + opa + "," + num +")",inter);
		}else{x = 1;}
		
		return x;
	}
	
	function trans(id1,id2,b,num,lim){
	//num es el numero en el que se va recorriendo los arreglos y lim el limite de los arreglos, los arreglos deben ser cuadrados
			var obj  = document.getElementById(id1);
			var obj1 = document.getElementById(id2);
				if(b==1){
					//alert('banner 2 valir de b='+ b +' valor de num=' + num);
					degrada(id2,100,5,10000);
					aclara(id1,0,5,10000);
					if(num < lim)
		setTimeout(function () {/*alert('imagen 2 '+imag2[num]);*/obj1.src="Pics/"+imag2[num]; if(num!=0)num=0; else num++;},12000);
					b=0;
				}else if (b==0){
					//alert('banner 1 valor de b='+ b +' valor de num=' + num);
					degrada(id1,100,5,10000);
					aclara(id2,0,5,10000);
					if(num < lim)
		setTimeout(function () {/*alert('imagen 1 '+imag1[num]);*/ obj.src="Pics/"+imag1[num];},12000);
					b=1;
				}
			setTimeout(function (){trans(id1,id2,b,num,lim);},24000);
	}