Basic Vector3 class

Vector3.js

function Vector3( x, y, z ) 
{
        this.x = x; 
	this.y = y; 
	this.z = z; 
	
	this.tx = 0; 
	this.ty = 0; 
	this.tz = 0; 
	this.sinRX = 0; 
	this.cosRX = 0; 
	this.cosRY = 0; 
	this.sinRY = 0; 
	
	this.rotateX = function( angle )
	{
		this.ty = this.y; 
		this.tz = this.z; 
		
		cosRX = Math.cos( angle );
		sinRX = Math.sin( angle );
		
		
		this.y = ( this.ty * cosRX ) + ( this.tz * sinRX );
		this.z = ( this.ty * -sinRX ) + ( this.tz * cosRX ); 
	}
	
	this.rotateY = function( angle )
	{
		this.tx = this.x; 
		this.tz = this.z; 
		
		cosRY = Math.cos( angle );
		sinRY = Math.sin( angle );
		
		
		this.x = ( this.tx * cosRY ) + ( this.tz * sinRY );
		this.z = ( this.tx * -sinRY ) + ( this.tz * cosRY ); 
	}

	this.reset = function( x, y, z )
	{
		this.x = x; 
		this.y = y; 
		this.z = z; 
	
	}
	
	this.plusEq = function ( v )
	{
		this.x += v.x; 
		this.y += v.y; 
		this.z += v.z; 
	}
	
	this.multiplyEq = function( s )
	{
		this.x *= s; 
		this.y *= s; 
		this.z *= s;
	}
}