var Frame_check1 = "1";
var Frame_check2 = "1";
var Frame_check3 = "1";
var Frame_check4 = "1";

function showFrame1()
{
	var url ="pbl.htm";
	var obj = document.all["contents"];
	
	if(!url) {return false;}
	if(!obj) {return false;}
	
	hideFrame1();

	obj.width =765;
	obj.height = 470;
	obj.style.top = 40;
	obj.style.left = 0;

	obj.src=url;
	//obj.style.display="block";
	
	if (Frame_check1 == "1") {
		Frame_check1 = "0";
	    setTimeout("show1()",1000); 
	}else{
		Frame_check1 = "1";
	}

}
function show1() {
    var obj = document.all["contents"];
    obj.style.display="block"
}


function hideFrame1()
{
	var obj = document.all["contents"];
	if(!obj) {return false;}
	obj.blur();
	obj.src = "about:blank";
	obj.style.display="none";
}

function showFrame2()
{
	var url ="qna.htm";
	var obj = document.all["contents"];
	
	if(!url) {return false;}
	if(!obj) {return false;}
	
	hideFrame2();

	obj.width =765;
	obj.height = 470;
	obj.style.top = 40;
	obj.style.left = 0;

	obj.src=url;
	//obj.style.display="block";

	if (Frame_check1 == "1") {
		Frame_check1 = "0";
	    setTimeout("show2()",1000); 
	}else{
		Frame_check1 = "1";
	}


}
function show2() {
    var obj = document.all["contents"];
    obj.style.display="block"
}


function hideFrame2()
{
	var obj = document.all["contents"];
	if(!obj) {return false;}
	obj.blur();
	obj.src = "about:blank";
	obj.style.display="none";
}

function showFrame3()
{
	var url ="com.htm";
	var obj = document.all["contents"];
	
	if(!url) {return false;}
	if(!obj) {return false;}
	
	hideFrame3();

	obj.width =765;
	obj.height = 470;
	obj.style.top = 40;
	obj.style.left = 0;

	obj.src=url;
	//obj.style.display="block";

	if (Frame_check1 == "1") {
		Frame_check1 = "0";
	    setTimeout("show3()",1000); 
	}else{
		Frame_check1 = "1";
	}


}
function show3() {
    var obj = document.all["contents"];
    obj.style.display="block"
}


function hideFrame3()
{
	var obj = document.all["contents"];
	if(!obj) {return false;}
	obj.blur();
	obj.src = "about:blank";
	obj.style.display="none";
}

function showFrame4()
{
	var url ="act.htm";
	var obj = document.all["contents"];
	
	if(!url) {return false;}
	if(!obj) {return false;}
	
	hideFrame4();

	obj.width =765;
	obj.height = 470;
	obj.style.top = 40;
	obj.style.left = 0;

	obj.src=url;
	//obj.style.display="block";

	if (Frame_check1 == "1") {
		Frame_check1 = "0";
	    setTimeout("show4()",1000); 
	}else{
		Frame_check1 = "1";
	} 


}
function show4() {
    var obj = document.all["contents"];
    obj.style.display="block"
}


function hideFrame4()
{
	var obj = document.all["contents"];
	if(!obj) {return false;}
	obj.blur();
	obj.src = "about:blank";
	obj.style.display="none";
}