function renew2_r4() {

	form = document.forms[0];

        	switch ( form.option2_r3.options[form.option2_r3.selectedIndex].value ) {
                       case "KS" :
			    while ( form.option_r4.options[0] ) {
				    form.option_r4.options[0] = null;
			    }
                            form.option_r4.options[0] = new Option("Standard Number","",true,true);
                            form.option_r4.options[1] = new Option("D 3536","D 3536",false,false);
                            form.option_r4.options[2] = new Option("D 3568","D 3568",false,false);
		            break;
                       case "ASTM" :
			    while ( form.option_r4.options[0] ) {
				    form.option_r4.options[0] = null;
			    }
                            form.option_r4.options[0] = new Option("Standard Number","",true,true);
                            form.option_r4.options[1] = new Option("A 500","A 500",false,false);
                            form.option_r4.options[2] = new Option("A 501","A 501",false,false);
                            form.option_r4.options[3] = new Option("A 511","A 511",false,false);
                            form.option_r4.options[4] = new Option("A 512","A 512",false,false);
                            form.option_r4.options[5] = new Option("A 513","A 513",false,false);
                            form.option_r4.options[6] = new Option("A 519","A 519",false,false);
                            form.option_r4.options[7] = new Option("A 554","A 554",false,false);
                            form.option_r4.options[8] = new Option("A 787","A 787",false,false);
                            form.option_r4.options[9] = new Option("A 847","A 847",false,false);
		            break;
                       case "JIS" :
			    while ( form.option_r4.options[0] ) {
				    form.option_r4.options[0] = null;
			    }
                            form.option_r4.options[0] = new Option("Standard Number","",true,true);
                            form.option_r4.options[1] = new Option("G 3446","G 3446",false,false);
                            form.option_r4.options[2] = new Option("G 3466","G 3466",false,false);
		            break;
                       case "BS" :
			    while ( form.option_r4.options[0] ) {
				    form.option_r4.options[0] = null;
			    }
                            form.option_r4.options[0] = new Option("Standard Number","",true,true);
                            form.option_r4.options[1] = new Option("1717","1717",false,false);
                            form.option_r4.options[2] = new Option("4127","4127",false,false);
                            form.option_r4.options[3] = new Option("6323 PART2","6323 PART2",false,false);
                            form.option_r4.options[4] = new Option("6323 PART3","6323 PART3",false,false);
                            form.option_r4.options[5] = new Option("6323 PART4","6323 PART4",false,false);
                            form.option_r4.options[6] = new Option("6323 PART5","6323 PART5",false,false);
                            form.option_r4.options[7] = new Option("6323 PART6","6323 PART6",false,false);
                            form.option_r4.options[8] = new Option("6323 PART7","6323 PART7",false,false);
                            form.option_r4.options[9] = new Option("6323 PART8","6323 PART8",false,false);
                            form.option_r4.options[10] = new Option("6363","6363",false,false);
		            break;
                       case "NF" :
			    while ( form.option_r4.options[0] ) {
				    form.option_r4.options[0] = null;
			    }
                            form.option_r4.options[0] = new Option("Standard Number","",true,true);
                            form.option_r4.options[1] = new Option("A49-643","A49-643",false,false);
                            form.option_r4.options[2] = new Option("A49-645","A49-645",false,false);
                            form.option_r4.options[3] = new Option("A49-647","A49-647",false,false);
		            break;
                       case "DIN" :
			    while ( form.option_r4.options[0] ) {
				    form.option_r4.options[0] = null;
			    }
                            form.option_r4.options[0] = new Option("Standard Number","",true,true);
                            form.option_r4.options[1] = new Option("2395","2395",false,false);
                            form.option_r4.options[2] = new Option("17100","17100",false,false);
                            form.option_r4.options[3] = new Option("17119","17119",false,false);
                            form.option_r4.options[4] = new Option("17455","17455",false,false);
		            break;
                       case "Others" :
			    while ( form.option_r4.options[0] ) {
				    form.option_r4.options[0] = null;
			    }
                            form.option_r4.options[0] = new Option("Standard Number","",true,true);
                            form.option_r4.options[1] = new Option("Others","Others",false,false);
		            break;
		}	


}