Simple Smoke or mist Effect to greet your visitors this Christmas and New year (2013). The major part of the smoke or mist effect script is done with the help of easing effect in jquery. The scripts looks quiet complex. But i have given a demo at the bottom . You can have a look and customize it according to your convenience.

<script src="http://code.jquery.com/jquery-1.8.3.min.js"></script>
if(!$.browser.msie){
		var a=0;for(;a<15;a+=1){setTimeout(function b(){var a=Math.random()*1e3+5e3,c=$("<div />",{"class":"smoke",css:{opacity:0,left:Math.random()*200+80}});$(c).appendTo("#viewport");$.when($(c).animate({opacity:1},{duration:a/4,easing:"easeOutCubic",queue:false,complete:function(){$(c).animate({opacity:0},{duration:a/3,easing:"easeOutCubic",queue:false})}}),$(c).animate({bottom:-$("#viewport").height()},{duration:a,easing:"easeOutCubic",queue:false})).then(function(){$(c).remove();b()})},Math.random()*3e3)}
	}else{		
	"use strict";var a=0;for(;a<15;a+=1){setTimeout(function b(){var a=Math.random()*1e3+5e3,c=$("<div />",{"class":"smoke",css:{left:Math.random()*200+80}});$(c).appendTo("#viewport");$.when($(c).animate({},{duration:a/4,easing:"easeOutCubic",queue:false,complete:function(){$(c).animate({},{duration:a/3,easing:"easeOutCubic",queue:false})}}),$(c).animate({bottom:-$("#viewport").height()},{duration:a,easing:"easeOutCubic",queue:false})).then(function(){$(c).remove();b()})},Math.random()*3e3)}}}())

We also have a javascript easing script

/*jquery easein*/
jQuery.easing[“jswing”]=jQuery.easing[“swing”];jQuery.extend(jQuery.easing,{def:”easeOutQuad”,swing:function(a,b,c,d,e){return jQuery.easing[jQuery.easing.def](a,b,c,d,e)},easeInQuad:function(a,b,c,d,e){return d*(b/=e)*b+c},easeOutQuad:function(a,b,c,d,e){return-d*(b/=e)*(b-2)+c},easeInOutQuad:function(a,b,c,d,e){if((b/=e/2)<1)return d/2*b*b+c;return-d/2*(--b*(b-2)-1)+c},easeInCubic:function(a,b,c,d,e){return d*(b/=e)*b*b+c},easeOutCubic:function(a,b,c,d,e){return d*((b=b/e-1)*b*b+1)+c},easeInOutCubic:function(a,b,c,d,e){if((b/=e/2)<1)return d/2*b*b*b+c;return d/2*((b-=2)*b*b+2)+c},easeInQuart:function(a,b,c,d,e){return d*(b/=e)*b*b*b+c},easeOutQuart:function(a,b,c,d,e){return-d*((b=b/e-1)*b*b*b-1)+c},easeInOutQuart:function(a,b,c,d,e){if((b/=e/2)<1)return d/2*b*b*b*b+c;return-d/2*((b-=2)*b*b*b-2)+c},easeInQuint:function(a,b,c,d,e){return d*(b/=e)*b*b*b*b+c},easeOutQuint:function(a,b,c,d,e){return d*((b=b/e-1)*b*b*b*b+1)+c},easeInOutQuint:function(a,b,c,d,e){if((b/=e/2)<1)return d/2*b*b*b*b*b+c;return d/2*((b-=2)*b*b*b*b+2)+c},easeInSine:function(a,b,c,d,e){return-d*Math.cos(b/e*(Math.PI/2))+d+c},easeOutSine:function(a,b,c,d,e){return d*Math.sin(b/e*(Math.PI/2))+c},easeInOutSine:function(a,b,c,d,e){return-d/2*(Math.cos(Math.PI*b/e)-1)+c},easeInExpo:function(a,b,c,d,e){return b==0?c:d*Math.pow(2,10*(b/e-1))+c},easeOutExpo:function(a,b,c,d,e){return b==e?c+d:d*(-Math.pow(2,-10*b/e)+1)+c},easeInOutExpo:function(a,b,c,d,e){if(b==0)return c;if(b==e)return c+d;if((b/=e/2)<1)return d/2*Math.pow(2,10*(b-1))+c;return d/2*(-Math.pow(2,-10*--b)+2)+c},easeInCirc:function(a,b,c,d,e){return-d*(Math.sqrt(1-(b/=e)*b)-1)+c},easeOutCirc:function(a,b,c,d,e){return d*Math.sqrt(1-(b=b/e-1)*b)+c},easeInOutCirc:function(a,b,c,d,e){if((b/=e/2)<1)return-d/2*(Math.sqrt(1-b*b)-1)+c;return d/2*(Math.sqrt(1-(b-=2)*b)+1)+c},easeInElastic:function(a,b,c,d,e){var f=1.70158;var g=0;var h=d;if(b==0)return c;if((b/=e)==1)return c+d;if(!g)g=e*.3;if(hDEMO

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