/*<![CDATA[*/
// Basic Element Animator (12-January-2007) DRAFT
// by Vic Phillips http://www.vicsjavascripts.org.uk

// To progressively change the Left, Top, Width, Height or Opacity of an element over a specified period of time.

// **** Application Notes

// **** The HTML Code
//
// when moving an element the inline or class rule style position of the element should be assigned as
// 'position:relative;' or 'position:absolute;'
//
// The element would normally be assigned a unique ID name.
//

// **** Executing the Effect(Script)
//
// The effect is executed by an event call to function 'zxcBAnimator('left','tst1',20,260,2000);'
// where:
// parameter 0 = the mode(see Note 1). (string)
// parameter 1 = the unique ID name or element object. (string or element object)
// parameter 2 = the start position of the effect. (digits, for opacity minimum 0, maximum 100)
// parameter 3 = the finish position of the effect. (digits, for opacity minimum 0, maximum 100)
// parameter 4 = (optional) period of time between the start and finish of the effect in milliseconds. (digits or defaults to 2000 milliSeconds)
//
// Note 1: The default units(excepting opacity) are 'px'.
// Note 2: Examples modes: 'left', 'top', 'width', 'height', 'opacity.
// For hyphenated modes, the first character after the hyphen must be upper case, all others lower case.
// Note 3: To 'toggle' the effect include '#' in parameter 0.
// The first call will set the toggle parameters.
// Subsequent calls with '#' in parameter 0 and the same start and finish parameters will 'toggle' the effect.
// Note 4: The function may be re-executed with a different set of parameters (start/finish time or period)
// whenever required, say from an onclick/mouseover/out event.
// The period parameter will be retained unless re-specified.
//
// **** Advanced Applications
//
// It may be required to access the current value of the effect.
// The element effect is accessible from the element property
// element effect = elementobject[mode.replace(/[-#]/g,'')+'oop'];
// where mode is parameter 0 of the initial call.
// An array storing the current, start and finish values of the element effect may be accessed
// from the element effect.data as fields 0, 1 and 2 respectively
//

// **** General
//
// All variable, function etc. names are prefixed with 'zxc' to minimise conflicts with other JavaScripts.
// These characters may be changed to characters of choice using global find and replace.
//
// The Functional Code (about 2K) is best as an External JavaScript.
//
// Tested with IE7 and Mozilla FireFox on a PC.
//



// **** Functional Code - NO NEED to Change


function zxcBAnimator(zxcmde,zxcobj,zxcsrt,zxcfin,zxctime){
if (typeof(zxcobj)=='string'){ zxcobj=document.getElementById(zxcobj); }
if (!zxcobj||(!zxcsrt&&!zxcfin)) return;
var zxcoop=zxcobj[zxcmde.replace(/[-#]/g,'')+'oop'];
if (zxcoop){
clearTimeout(zxcoop.to);
if (zxcoop.srtfin[0]==zxcsrt&&zxcoop.srtfin[1]==zxcfin&&zxcmde.match('#')) zxcoop.update([zxcoop.data[0],(zxcoop.srtfin[0]==zxcoop.data[2])?zxcfin:zxcsrt],zxctime);
else zxcoop.update([zxcsrt,zxcfin],zxctime);
}
else zxcobj[zxcmde.replace(/[-#]/g,'')+'oop']=new zxcBAnimatorOOP(zxcmde,zxcobj,zxcsrt,zxcfin,zxctime);
}

function zxcBAnimatorOOP(zxcmde,zxcobj,zxcsrt,zxcfin,zxctime){
this.srtfin=[zxcsrt,zxcfin];
this.to=null;
this.obj=zxcobj;
this.mde=zxcmde.replace(/[-#]/g,'');
this.update([zxcsrt,zxcfin],zxctime);
}

zxcBAnimatorOOP.prototype.update=function(zxcsrtfin,zxctime){
this.time=zxctime||this.time||2000;
if (zxcsrtfin[0]==zxcsrtfin[1]) return;
this.data=[zxcsrtfin[0],zxcsrtfin[0],zxcsrtfin[1]];
this.srttime=new Date().getTime();
this.cng();
}

zxcBAnimatorOOP.prototype.cng=function(){
var zxcms=new Date().getTime()-this.srttime;
this.data[0]=(this.data[2]-this.data[1])/this.time*zxcms+this.data[1];
if (this.mde!='opacity') this.obj.style[this.mde]=this.data[0]+'px';
else this.opacity(this.data[0]);
if (zxcms<this.time) this.to=setTimeout(function(zxcoop){return function(){zxcoop.cng();}}(this), 10);
else {
if (this.mde!='opacity') this.obj.style[this.mde]=this.data[2]+'px';
else this.opacity(this.data[2]);
}
}

zxcBAnimatorOOP.prototype.opacity=function(zxcopc){
if (zxcopc<0||zxcopc>100){ return; }
this.obj.style.filter='alpha(opacity='+zxcopc+')';
this.obj.style.opacity=this.obj.style.MozOpacity=this.obj.style.KhtmlOpacity=zxcopc/100-.001;
}


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