function newImage(arg) 
{	
	if (document.images) 
	{
		rslt = new Image();		
		rslt.src = arg;		
		return rslt;	
	}
}

function changeImagesArray(array) 
{
	if (preloadFlag == true) 
	{		
		d = document; var img;		
		for (var i=0; i<array.length; i+=2) 
		{			
			img = null; n = array[i];			
			if (d.images) 
			{
				img = d.images[n];
			}			
			if (!img && d.getElementById) 
			{
				img = d.getElementById(n);
			}			
			if (img) 
			{
				img.src = array[i+1];
			}		
		}
	}
}

function changeImages() 
{	
	changeImagesArray(changeImages.arguments);
}

var preloadFlag = false;

function preloadImages() 
{	
	if (document.images) 
	{		
		pre_about_us_over = newImage('images/about_us-over.gif');		
		pre_services_over = newImage('images/services-over.gif');		
		pre_project_gallery_over = newImage('images/project_gallery-over.gif');		
		pre_testimonials_over = newImage('images/testimonials-over.gif');		
		pre_contact_us_over = newImage('images/contact_us-over.gif');		
		pre_contact_us_down = newImage('images/contact_us-down.gif');		
		preloadFlag = true;	
	}
}