var c1t;
var c2t;
var c3t;
var c4t;

function expand_concert_1() {
	clearTimeout(c1t);
    var con1 = document.getElementById('concert_1');
    var con1_h = parseInt(con1.style.height);
    var con1_t = parseInt(con1.style.top);
    var back1 = document.getElementById('concert_1_back');
    var back1_h = parseInt(back1.style.height);
    if(con1_h < 275) {
        con1_h = (con1_h + 4);
        con1_t = (con1_t - 4);
        back1_h = (back1_h + 4);
        con1.style.height = con1_h+"px";
        con1.style.top = con1_t+"px";
        back1.style.height = back1_h+"px";
        c1t = setTimeout("expand_concert_1()", 1);
    } else {
		clearTimeout(c1t);
        document.getElementById('concert_1_tab').style.backgroundImage="url(./furniture/concert_1_d.png)";
    }
}

function collapse_concert_1() {
    clearTimeout(c1t);
    var con1 = document.getElementById('concert_1');
    var con1_h = parseInt(con1.style.height);
    var con1_t = parseInt(con1.style.top);
    var back1 = document.getElementById('concert_1_back');
    var back1_h = parseInt(back1.style.height);
    if(con1_h > 34) {
        con1_h = (con1_h - 4);
        con1_t = (con1_t + 4);
        back1_h = (back1_h - 4);
        con1.style.height = con1_h+"px";
        con1.style.top = con1_t+"px";
        back1.style.height = back1_h+"px";
        c1t = setTimeout("collapse_concert_1()", 1);
    } else {
		clearTimeout(c1t);
        document.getElementById('concert_1_tab').style.backgroundImage="url(./furniture/concert_1.png)";
    }
}

function expand_concert_2() {
	clearTimeout(c2t);
    var con2 = document.getElementById('concert_2');
    var con2_h = parseInt(con2.style.height);
    var con2_t = parseInt(con2.style.top);
    var back2 = document.getElementById('concert_2_back');
    var back2_h = parseInt(back2.style.height);
    if(con2_h < 275) {
        con2_h = (con2_h + 4);
        con2_t = (con2_t - 4);
        back2_h = (back2_h + 4);
        con2.style.height = con2_h+"px";
        con2.style.top = con2_t+"px";
        back2.style.height = back2_h+"px";
        c2t = setTimeout("expand_concert_2()", 1);
    } else {
		clearTimeout(c2t);
        document.getElementById('concert_2_tab').style.backgroundImage="url(./furniture/concert_2_d.png)";
    }
}

function collapse_concert_2() {
	clearTimeout(c2t);
    var con2 = document.getElementById('concert_2');
    var con2_h = parseInt(con2.style.height);
    var con2_t = parseInt(con2.style.top);
    var back2 = document.getElementById('concert_2_back');
    var back2_h = parseInt(back2.style.height);
    if(con2_h > 34) {
        con2_h = (con2_h - 4);
        con2_t = (con2_t + 4);
        back2_h = (back2_h - 4);
        con2.style.height = con2_h+"px";
        con2.style.top = con2_t+"px";
        back2.style.height = back2_h+"px";
        c2t = setTimeout("collapse_concert_2()", 1);
    } else {
		clearTimeout(c2t);
        document.getElementById('concert_2_tab').style.backgroundImage="url(./furniture/concert_2.png)";
    }
}

function expand_concert_3() {
	clearTimeout(c3t);
    var con3 = document.getElementById('concert_3');
    var con3_h = parseInt(con3.style.height);
    var con3_t = parseInt(con3.style.top);
    var back3 = document.getElementById('concert_3_back');
    var back3_h = parseInt(back3.style.height);
    if(con3_h < 275) {
        con3_h = (con3_h + 4);
        con3_t = (con3_t - 4);
        back3_h = (back3_h + 4);
        con3.style.height = con3_h+"px";
        con3.style.top = con3_t+"px";
        back3.style.height = back3_h+"px";
        c3t = setTimeout("expand_concert_3()", 1);
    } else {
		clearTimeout(c3t);
        document.getElementById('concert_3_tab').style.backgroundImage="url(./furniture/concert_3_d.png)";
    }
}

function collapse_concert_3() {
	clearTimeout(c3t);
    var con3 = document.getElementById('concert_3');
    var con3_h = parseInt(con3.style.height);
    var con3_t = parseInt(con3.style.top);
    var back3 = document.getElementById('concert_3_back');
    var back3_h = parseInt(back3.style.height);
    if(con3_h > 34) {
        con3_h = (con3_h - 4);
        con3_t = (con3_t + 4);
        back3_h = (back3_h - 4);
        con3.style.height = con3_h+"px";
        con3.style.top = con3_t+"px";
        back3.style.height = back3_h+"px";
        c3t = setTimeout("collapse_concert_3()", 1);
    } else {
		clearTimeout(c3t);
        document.getElementById('concert_3_tab').style.backgroundImage="url(./furniture/concert_3.png)";
    }
}

function expand_concert_4() {
	clearTimeout(c4t);
    var con4 = document.getElementById('concert_4');
    var con4_h = parseInt(con4.style.height);
    var con4_t = parseInt(con4.style.top);
    var back4 = document.getElementById('concert_4_back');
    var back4_h = parseInt(back4.style.height);
    if(con4_h < 275) {
        con4_h = (con4_h + 4);
        con4_t = (con4_t - 4);
        back4_h = (back4_h + 4);
        con4.style.height = con4_h+"px";
        con4.style.top = con4_t+"px";
        back4.style.height = back4_h+"px";
        c4t = setTimeout("expand_concert_4()", 1);
    } else {
		clearTimeout(c4t);
        document.getElementById('concert_4_tab').style.backgroundImage="url(./furniture/concert_4_d.png)";
    }
}

function collapse_concert_4() {
	clearTimeout(c4t);
	var con4 = document.getElementById('concert_4');
    var con4_h = parseInt(con4.style.height);
    var con4_t = parseInt(con4.style.top);
    var back4 = document.getElementById('concert_4_back');
    var back4_h = parseInt(back4.style.height);
	if(con4_h > 34) {
        con4_h = (con4_h - 4);
        con4_t = (con4_t + 4);
        back4_h = (back4_h - 4);
        con4.style.height = con4_h+"px";
        con4.style.top = con4_t+"px";
        back4.style.height = back4_h+"px";
        c4t = setTimeout("collapse_concert_4()", 1);
    } else {
		clearTimeout(c4t);
        document.getElementById('concert_4_tab').style.backgroundImage="url(./furniture/concert_4.png)";
    }
}