/**
 *
 */
function setNavPosition(){
	
	oldp = newp = 0;
	
	aFrm = $('ma_navigation');
	
	oldp = aFrm.style.paddingTop ? parseInt(aFrm.style.paddingTop) : 0;
	
	pageScroll = document.getPageScroll();
	
	scrollY = parseInt(pageScroll[1]) - 140;
	
	newp = scrollY > 0 ? scrollY : 0;
	
	if( newp > oldp ) {
		
		step = Math.round( ( 1 - ( oldp / newp ) ) * 10 ) + 1;
		
		cpos = (oldp + step) > newp ? newp : oldp + step;
		
		aFrm.style.paddingTop = cpos + 'px';
		
	} else if( newp < oldp ) {
		
		step = Math.round( oldp / 10 );
		
		step = step ? step : 1;
		
		cpos = (oldp - step) < 0 ? 0 : oldp - step;
		
		aFrm.style.paddingTop = cpos + 'px';
		
	}
	
};