function isblank(s){
	if(s=='')
		return false;
	var i=s.indexOf(' ');
	var k=0;
	while(i>=0){
		k++;
		i=s.indexOf(' ',i+1);
	}
	if(k==s.length)
		return false
	else
		return true
}

function init_request(){
	http_request = false;
	if(window.XMLHttpRequest) { //Mozilla
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			http_request.overrideMimeType("text/xml");
		}
	}else if (window.ActiveXObject) { // IE
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
	if (!http_request) { // faild;
		return false;
	}
}