<script>
function generate()
{
	var rowCount = document.getElementById('rowCount').value;
	var colCount = document.getElementById('colCount').value;
	var tbl = document.createElement('table');
	tbl.insertRow(- 1 );
	for (var j= 0 ; j<=colCount; j++)	tbl.tBodies[ 0 ].rows[ 0 ].insertCell(- 1 ).innerHTML = j||' ';
	for (var i= 1 ; i<=rowCount; i++)
	{
		tbl.insertRow(- 1 ).insertCell(- 1 ).innerHTML = i;
		for (var j= 1 ; j<=colCount; j++)	
		{
			var input = document.createElement('input');
			input.id=input.name='m_'+i+'_'+j;
			input.size = "5";
			tbl.tBodies[ 0 ].rows[i].insertCell(- 1 ).appendChild(input);
		}
	}
	document.body.appendChild(tbl);
}
</script>
rowCount: <input id='rowCount' type='text' value='4' /><br />
colCount: <input id='colCount' type='text' value='5' /><br />
<button onclick="generate()">generate</button>