// page height
var ua = 'msie';
var W=navigator.userAgent.toLowerCase();
if(W.indexOf("opera")!=-1){ua='opera';} else if(W.indexOf("safari")!=-1 || W.indexOf('applewebkit')!=-1){ua='safari';} else if(W.indexOf("msie")!=-1){ua='msie';} else if(W.indexOf("mozilla")!=-1){ua='gecko';}


function pageHeight()
{
	var headerHeight = document.getElementById('header').offsetHeight;
	var footerHeight = document.getElementById('footer').offsetHeight;
	var contentObj = document.getElementById('contentpad');
	var	contentHeight = contentObj.offsetHeight;
	var docHeight = headerHeight + contentHeight + footerHeight;
	var windowHeight;

	if (ua == 'safari' || ua == 'opera')
	{ windowHeight = document.body.scrollHeight; alert('x1'); }
	else
	{ windowHeight = document.documentElement.clientHeight;  }
	
	if (docHeight < windowHeight)
	{ contentObj.style.height = windowHeight - headerHeight - footerHeight - 48 + "px";  }
}