Cursor con destellos

Bueno este truco consiste en que cuando movamos el cursor por nuestro blog, el puntero va soltando destellos de este modo

Queda bastante simpático, para conseguirlo tendremos que ir a diseño>edición de HTML y buscar </head> y justo despues pegaremos lo siguiente:

<script type='text/javascript'>

// <![CDATA[

var colour="#FFFFFF";

var sparkles=40;

var x=ox=400;

var y=oy=300;

var swide=800;

var shigh=600;

var sleft=sdown=0;

var tiny=new Array();

var star=new Array();

var starv=new Array();

var starx=new Array();

var stary=new Array();

var tinyx=new Array();

var tinyy=new Array();

var tinyv=new Array();

window.onload=function() { if (document.getElementById) {

var i, rats, rlef, rdow;

for (var i=0; i<sparkles; i++) {

var rats=createDiv(3, 3);

rats.style.visibility="hidden";

document.body.appendChild(tiny[i]=rats);

starv[i]=0;

tinyv[i]=0;

var rats=createDiv(5, 5);

rats.style.backgroundColor="transparent";

rats.style.visibility="hidden";

var rlef=createDiv(1, 5);

var rdow=createDiv(5, 1);

rats.appendChild(rlef);

rats.appendChild(rdow);

rlef.style.top="2px";

rlef.style.left="0px";

rdow.style.top="0px";

rdow.style.left="2px";

document.body.appendChild(star[i]=rats);

}

set_width();

sparkle();

}}

function sparkle() {

var c;

if (x!=ox || y!=oy) {

ox=x;

oy=y;

for (c=0; c<sparkles; c++) if (!starv[c]) {

star[c].style.left=(starx[c]=x)+"px";

star[c].style.top=(stary[c]=y)+"px";

star[c].style.clip="rect(0px, 5px, 5px, 0px)";

star[c].style.visibility="visible";

starv[c]=50;

break;

}

}

for (c=0; c<sparkles; c++) {

if (starv[c]) update_star(c);

if (tinyv[c]) update_tiny(c);

}

setTimeout("sparkle()", 40);

}

function update_star(i) {

if (--starv[i]==25) star[i].style.clip="rect(1px, 4px, 4px, 1px)";

if (starv[i]) {

stary[i]+=1+Math.random()*3;

if (stary[i]<shigh+sdown) {

star[i].style.top=stary[i]+"px";

starx[i]+=(i%5-2)/5;

star[i].style.left=starx[i]+"px";

}

else {

star[i].style.visibility="hidden";

starv[i]=0;

return;

}

}

else {

tinyv[i]=50;

tiny[i].style.top=(tinyy[i]=stary[i])+"px";

tiny[i].style.left=(tinyx[i]=starx[i])+"px";

tiny[i].style.width="2px";

tiny[i].style.height="2px";

star[i].style.visibility="hidden";

tiny[i].style.visibility="visible"

}

}

function update_tiny(i) {

if (--tinyv[i]==25) {

tiny[i].style.width="1px";

tiny[i].style.height="1px";

}

if (tinyv[i]) {

tinyy[i]+=1+Math.random()*3;

if (tinyy[i]<shigh+sdown) {

tiny[i].style.top=tinyy[i]+"px";

tinyx[i]+=(i%5-2)/5;

tiny[i].style.left=tinyx[i]+"px";

}

else {

tiny[i].style.visibility="hidden";

tinyv[i]=0;

return;

}

}

else tiny[i].style.visibility="hidden";

}

document.onmousemove=mouse;

function mouse(e) {

set_scroll();

y=(e)?e.pageY:event.y+sdown;

x=(e)?e.pageX:event.x+sleft;

}

function set_scroll() {

if (typeof(self.pageYOffset)=="number") {

sdown=self.pageYOffset;

sleft=self.pageXOffset;

}

else if (document.body.scrollTop || document.body.scrollLeft) {

sdown=document.body.scrollTop;

sleft=document.body.scrollLeft;

}

else if (document.documentElement && (document.documentElement.scrollTop || document.documentElement.scrollLeft)) {

sleft=document.documentElement.scrollLeft;

sdown=document.documentElement.scrollTop;

}

else {

sdown=0;

sleft=0;

}

}

window.onresize=set_width;

function set_width() {

if (typeof(self.innerWidth)=="number") {

swide=self.innerWidth;

shigh=self.innerHeight;

}

else if (document.documentElement && document.documentElement.clientWidth) {

swide=document.documentElement.clientWidth;

shigh=document.documentElement.clientHeight;

}

else if (document.body.clientWidth) {

swide=document.body.clientWidth;

shigh=document.body.clientHeight;

}

}

function createDiv(height, width) {

var div=document.createElement("div");

div.style.position="absolute";

div.style.height=height+"px";

div.style.width=width+"px";

div.style.overflow="hidden";

div.style.backgroundColor=colour;

return (div);

}

// ]]>

</script>

Con var colour="#FFFFFF" podemos modificar el color del efecto, espero os guste