if (document.images) {
     var portfolio19= new Image(); 
     portfolio19.src="img/Portfolio/portfolio19.jpg"; 
     var portfolio20= new Image(); 
     portfolio20.src="img/Portfolio/portfolio20.jpg";  
     var portfolio21= new Image(); 
     portfolio21.src="img/Portfolio/portfolio21.jpg";  
     var portfolio22= new Image(); 
     portfolio22.src="img/Portfolio/portfolio22.jpg";  
     var portfolio23= new Image(); 
     portfolio23.src="img/Portfolio/portfolio23.jpg";  
     var portfolio24= new Image(); 
     portfolio24.src="img/Portfolio/portfolio24.jpg";  
}
/* no need to edit past this point (unless you want to add more image slots) */

function get_Image4(imgName)
{
 if (document.images)
 {
   	document.images['changer4'].src = 'img/Portfolio/' + imgName + '.jpg';

 }
}