// window.onload =
window.attachEvent( "onload", 
	function( ){
		if ( document.getElementById( 'mbox' ) ){
			// 存在mbox，则认为是三列布局
			// 求三列高度最大数	
			var size = 0;
			size = document.getElementById('fbox').scrollHeight > document.getElementById( 'mbox' ).scrollHeight ? document.getElementById('fbox').scrollHeight : document.getElementById( 'mbox' ).scrollHeight;
			size = document.getElementById( 'sbox' ).scrollHeight > size ? document.getElementById( 'sbox' ).scrollHeight : size;
			// 设置三列高度
			document.getElementById( 'fbox' ).style.height = size + "px";
			document.getElementById( 'mbox' ).style.height = size + "px";
			document.getElementById( 'sbox' ).style.height = size + "px";
		}else if( document.getElementById( 'pagelist' ) ){
			var size = document.getElementById('bodybox').scrollHeight;
			document.getElementById( 'pagelist' ).style.height = size + "px";
			document.getElementById( 'sbox' ).style.height = size + "px";
		}else{
			if ( document.getElementById('right').scrollHeight > document.getElementById( 'fbox' ).scrollHeight )
				document.getElementById( 'fbox' ).style.height = document.getElementById('right').scrollHeight + "px";
			else
				document.getElementById( 'right' ).style.height = document.getElementById('fbox').scrollHeight + "px";
		}
	}
)