function only_no(field)
{
var vldNums="0123456789";
	if (field.value.length>0)
	{
		for (var j = 0; j <field.value.length; j++)
		{
			if (vldNums.indexOf(field.value.charAt(j)) == -1)
			{
				field.value="";
				return false;
			}
		}
	}
}


function only_char(field)
{
var vldChars="abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	if (field.value.length>0 )
	{
		for (var j = 0; j <field.value.length; j++)
		{
			if (vldChars.indexOf(field.value.charAt(j)) == -1)
			{
				field.value="";
				return false;
			}
		}
	}
}

function chkFields(field,message)
{

	if(field.value.indexOf("add")!=-1 || field.value.indexOf("drop")!=-1 || field.value.indexOf("create")!=-1 || field.value.indexOf("insert")!=-1 || field.value.indexOf("select")!=-1 || field.value.indexOf("update")!=-1 || field.value.indexOf("replace")!=-1 || field.value.indexOf("delete")!=-1){
		alert (message);
		field.focus();
		return 1;
	}
	
	var iChars ="*-|,\":<>[]{}`\';()&$#%/";
	for (var i = 0;i<field.value.length;i++) 
	{
		if (iChars.indexOf(field.value.charAt(i)) != -1)
			{
				alert (message);
				field.focus() 
				return 1;
			}
	}

}

function chk_spe_char(field,message)
{

	var iChars ="*-|,\":<>[]{}`\';()&$#%/";
	for (var i = 0;i<field.value.length;i++) 
	{
		if (iChars.indexOf(field.value.charAt(i)) != -1)
			{
				alert (message);
				field.focus() 
				return 1;
			}
	}

}

function chk_add(field,message)
{

	var iChars ="*-|\":<>[]{}`\';()&$#%";
	for (var i = 0;i<field.value.length;i++) 
	{
		if (iChars.indexOf(field.value.charAt(i)) != -1)
			{
				alert (message);
				field.focus() 
				return 1;
			}
	}

}