function setColoumnHeight()
	{
	hl = document.getElementById('l-box').offsetHeight;
	hc = document.getElementById('c-box').offsetHeight;
	
	if(document.getElementById('r-box'))
	{
		hr = document.getElementById('r-box').offsetHeight;
	}
	else
	{
		hr = 0;
	}
	
		if (hl <= 500 && hc <= 500) {
			document.getElementById("l-box").style.height = 500 + 'px';
			document.getElementById("c-box").style.height = 500 + 'px';
			
		} 
		else if (hl <= hc ){
			document.getElementById("l-box").style.height = hc + 'px';
		}
		else if (hl <= hr ){
			document.getElementById("l-box").style.height = hr + 'px';
		}
		
	}