function tab(nextElement, event){
	if (event && event.which)
    {
        var e = event;
        var charCode=e.which;
    }
    else
    {
        var e = window.event;
        try{
	        var charCode=e.keyCode;
        }catch(err){
        	return;
        }
    }
    if (charCode == 13) {
    	document.getElementById(nextElement).focus();
    	if ((document.getElementById('vendorid').value == '') || (document.getElementById('password').value == '')) {
    		try{
    		event.stopPropagation();
    		event.preventDefault();
    		}catch(err){
    			try{
    				event.returnValue = false;
    			}catch(err){}
    		}
    	}
    }
}
function checkForm(){
	if (document.getElementById('vendorid').value == '') {
		alert("Please provide your UserID");
		document.getElementById('vendorid').focus();
		return false;
	}
	if (document.getElementById('password').value == '') {
		alert("Please provide your Password");
		document.getElementById('password').focus();
		return false;
	}
	return true;
}