function veritclecenterdiv() { 
	
	if (document.getElementById) { 
		
		var targetdivheight = document.getElementById('main').offsetHeight;
		
		var pdivheight = document.getElementById('vertcenterp').offsetHeight;
		
		if (targetdivheight > 0) { 
		
			if (pdivheight > 0) {
				
				var divtopmargin = (targetdivheight - pdivheight) / 2;

				var groundElement1 = document.getElementById('vertcenterp');
				
				groundElement1.style.marginTop = divtopmargin + 'px';

			}
       
	   } 
	
	} 

}

window.onload = veritclecenterdiv;