/************************************
Editor: Ad Nhanh Tran
BLOG THU THUAT WORDPRESS, WEBSITE, SEO, LAP TRINH
Website: www.thietkewebchuanseo.net
Email: info.webchuanseo@gmail.com
Plugin: Hieu ung tuyet roi, giang sinh


Bạn copy code bên dưới và thay bằng tên file như hướng dẫn trong bài viết hoặc tên theo bạn chọn, ở đây mình đặt tên:  tuyet-roi.js
*************************************/
//CAU HINH TUYET ROI
var snowmax=150;//So luong tuyet roi
var snowcolor=new Array("#ffffff","#ffffff","#ffffff","#ffffff","#ffffff"); //Mau sac cac hat tuyet roi

var snowtype=new Array("Times","Arial","Times","Verdana");var snowletter="*";var sinkspeed=0.6;var snowmaxsize=50;var snowminsize=8;var snowingzone=1;var snow=new Array();var marginbottom;var marginright;var timer;var i_snow=0;var x_mv=new Array();var crds=new Array();var lftrght=new Array();var browserinfos=navigator.userAgent;var ie5=document.all&&document.getElementById&&!browserinfos.match(/Opera/);var ns6=document.getElementById&&!document.all;var opera=browserinfos.match(/Opera/);var browserok=ie5||ns6||opera;function randommaker(range){rand=Math.floor(range*Math.random());return rand}function initsnow(){if(ie5||opera){marginbottom=document.body.scrollHeight;marginright=document.body.clientWidth-15}else if(ns6){marginbottom=document.body.scrollHeight;marginright=window.innerWidth-15}var snowsizerange=snowmaxsize-snowminsize;for(i=0;i<=snowmax;i++){crds[i]=0;lftrght[i]=Math.random()*15;x_mv[i]=0.03+Math.random()/10;snow[i]=document.getElementById("s"+i);snow[i].style.fontFamily=snowtype[randommaker(snowtype.length)];snow[i].size=randommaker(snowsizerange)+snowminsize;snow[i].style.fontSize=snow[i].size+'px';snow[i].style.color=snowcolor[randommaker(snowcolor.length)];snow[i].style.zIndex=1000;snow[i].sink=sinkspeed*snow[i].size/5;if(snowingzone==1){snow[i].posx=randommaker(marginright-snow[i].size)}if(snowingzone==2){snow[i].posx=randommaker(marginright/2-snow[i].size)}if(snowingzone==3){snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/4}if(snowingzone==4){snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/2}snow[i].posy=randommaker(2*marginbottom-marginbottom-2*snow[i].size);snow[i].style.left=snow[i].posx+'px';snow[i].style.top=snow[i].posy+'px'}movesnow()}function movesnow(){for(i=0;i<=snowmax;i++){crds[i]+=x_mv[i];snow[i].posy+=snow[i].sink;snow[i].style.left=snow[i].posx+lftrght[i]*Math.sin(crds[i])+'px';snow[i].style.top=snow[i].posy+'px';if(snow[i].posy>=marginbottom-2*snow[i].size||parseInt(snow[i].style.left)>(marginright-3*lftrght[i])){if(snowingzone==1){snow[i].posx=randommaker(marginright-snow[i].size)}if(snowingzone==2){snow[i].posx=randommaker(marginright/2-snow[i].size)}if(snowingzone==3){snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/4}if(snowingzone==4){snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/2}snow[i].posy=0}}var timer=setTimeout("movesnow()",30)}for(i=0;i<=snowmax;i++){document.write("<span id='s"+i+"' style='position:absolute;top:-"+snowmaxsize+"'>"+snowletter+"</span>")}if(browserok){window.onload=initsnow}