Slider sencillo con Javascript

Si queremos mostrar varias imagenes en nuestro blog o web, que mejor que contar con un Slider, de los cuales existen muchos y de diversos tipos. El que te presento en este caso, esta realizado con Javascript y es muy sencillo de implementar. Tan solo debes copiar el codigo y añadirlo alli donde quieras mostrarlo. Tienes que poner las urls de las imagenes donde esta indicado en rojo, si quieres poner mas tan solo tienes que añadir la linea leftrightslide[0]='<img border="0" height="300" src="URL IMAGEN" width="500" />' tantas veces como quieras.

CODIGO:

<center><div style="width:500px;height:px;-webkit-border-radius: 20px;-moz-border-radius: 20px;border-radius: 20px;background-color:#000000;padding:15px;">
<script type="text/javascript">
var sliderwidth="500px" // Ancho slider
var sliderheight="300px" // Alto slider
var slidespeed=5 // velocidad
slidebgcolor="#000000"
var leftrightslide=new Array()
var finalslide=''
leftrightslide[0]='<img border="0" src="URL IMAGEN" width="500" height="300">'
leftrightslide[1]='<img border="0" src="URL IMAGEN" width="500" height="300">'
leftrightslide[2]='<img border="0" src="URL IMAGEN" width="500" height="300">'
leftrightslide[3]='<img border="0" src="URL IMAGEN" width="500" height="300">'
leftrightslide[4]='<img border="0" src="URL IMAGEN" width="500" height="300">'
leftrightslide[5]='<img border="0" src="URL IMAGEN" width="500" height="300">'
var imagegap=""
var slideshowgap=5
var copyspeed=slidespeed
leftrightslide='<nobr>'+leftrightslide.join(imagegap)+'</nobr>'
var iedom=document.all||document.getElementById
if (iedom)
document.write('<span id="temp" style="visibility:hidden;position:absolute;top:-100px;left:-9000px">'+leftrightslide+'</span>')
var actualwidth=''
var cross_slide, ns_slide
function fillup(){
if (iedom){
cross_slide=document.getElementById? document.getElementById("test2") : document.all.test2
cross_slide2=document.getElementById? document.getElementById("test3") : document.all.test3
cross_slide.innerHTML=cross_slide2.innerHTML=leftrightslide
actualwidth=document.all? cross_slide.offsetWidth : document.getElementById("temp").offsetWidth
cross_slide2.style.left=actualwidth+slideshowgap+"px"
}
else if (document.layers){
ns_slide=document.ns_slidemenu.document.ns_slidemenu2
ns_slide2=document.ns_slidemenu.document.ns_slidemenu3
ns_slide.document.write(leftrightslide)
ns_slide.document.close()
actualwidth=ns_slide.document.width
ns_slide2.left=actualwidth+slideshowgap
ns_slide2.document.write(leftrightslide)
ns_slide2.document.close()
}
lefttime=setInterval("slideleft()",30)
}
window.onload=fillup
function slideleft(){
if (iedom){
if (parseInt(cross_slide.style.left)>(actualwidth*(-1)+8))
cross_slide.style.left=parseInt(cross_slide.style.left)-copyspeed+"px"
else
cross_slide.style.left=parseInt(cross_slide2.style.left)+actualwidth+slideshowgap+"px"
if (parseInt(cross_slide2.style.left)>(actualwidth*(-1)+8))
cross_slide2.style.left=parseInt(cross_slide2.style.left)-copyspeed+"px"
else
cross_slide2.style.left=parseInt(cross_slide.style.left)+actualwidth+slideshowgap+"px"
}
else if (document.layers){
if (ns_slide.left>(actualwidth*(-1)+8))
ns_slide.left-=copyspeed
else
ns_slide.left=ns_slide2.left+actualwidth+slideshowgap

if (ns_slide2.left>(actualwidth*(-1)+8))
ns_slide2.left-=copyspeed
else
ns_slide2.left=ns_slide.left+actualwidth+slideshowgap
}
}
if (iedom||document.layers){
with (document){
document.write('<table border="0" cellspacing="0" cellpadding="0"><td>')
if (iedom){
write('<div style="position:relative;width:'+sliderwidth+';height:'+sliderheight+';overflow:hidden">')
write('<div style="position:absolute;width:'+sliderwidth+';height:'+sliderheight+';background-color:'+slidebgcolor+'" onmouseover="copyspeed=0" onmouseout="copyspeed=slidespeed">')
write('<div id="test2" style="position:absolute;left:0px;top:0px"></div>')
write('<div id="test3" style="position:absolute;left:-1000px;top:0px"></div>')
write('</div></div>')
}
else if (document.layers){
write('<ilayer width="+sliderwidth+" height="+sliderheight+" name="ns_slidemenu" bgcolor="+slidebgcolor+">')
write('<layer left="0" top="0" onmouseover="copyspeed=0" onmouseout="copyspeed=slidespeed" name="ns_slidemenu2"></layer>')
write('<layer left="0" top="0" onmouseover="copyspeed=0" onmouseout="copyspeed=slidespeed" name="ns_slidemenu3"></layer>')
write('</ilayer>')
}
document.write('</td></table>')
}
}
</script></div></center>