function checkNum (){
	key=(event.which ? event.which : event.keyCode);
	//alert(event.which);
	if((key < 48 || key > 57) && key!=8 && key!=13 && key!=27)
		return false;
}

	function print_r2(param){
		myWin=open('', 'print_r2','width=600, height=400, scrollbars=yes, resizable=yes');
		myWin.document.writeln('<pre style="border: 1px solid gray; background-color: #fee; font-family: tahoma; font-size: 11px; padding: 10px;">');
		if(typeof(param)=='object' && param!=null) {
			for(element in param) {
				myWin.document.writeln(element+'='+eval('param.'+element));
			}
		}else{
			myWin.document.writeln('var='+param);
		}
		myWin.document.writeln('</pre>');
		//myWin.document.close();
	}