انتخاب ۲ زیر موضوع همزمان

[neda_barnamenevis]

سلام
من یک کد جاوا اسکریپت دارم
توی کد php وقتی یک موضوع انتخاب می کنم این زیر موضوع ها فال می شن مثلا اگر اولین موضوع را انتخاب کنیمdArray[1]انتخاب می شه
حالا من می خوام اگه ۲ تا موضوع انتخاب کردم ۲ تا زیر موضوع برام انتخاب بشه

function createList(nameID , listIndex , hidInputNameID , formNameID)

{

document.getElementById(nameID).length = 0

document.forms[formNameID][hidInputNameID].value = '';

var dArray = new Array()

dArray[1]=new Array('','Computational Fluid Dynamics','Experimental Aerodynamics','Subsonic Aerodynamics','High Speed Aerodynamics','Air Vehicle Aerodynamics','Rotary Wing Aerodynamics','Theoretical Aerodynamics','Aerodynamics Optimization','Inviscid and Viscous Flows','Solid & Fluid Interaction','Flow Control');

dArray[2]=new Array('','Combustion & Reacting Flow','Multi-phase Flows','Gas Turbine & Jet Engines','Acoustics','Turbomachinary','Propulsion Systems','Computational Fluid Dynamics','Heat Transfer','Internal Flow','Pollution & Control','Atmosphere');

dArray[3]=new Array('','Creep, Fatigue & Fracture','Destructive & Non-Destructive Tests','Structural Optimization','Composites','Buckling','Aeroelastic ity','Vibration','Experimental Stress Analysis','Computational Solid Mechanics','Nano and new Material','Solid & Fluid Interaction','Manufacturing Methods','Coating','Life Endurance & Estimation');

dArray[4]=new Array('','Flight Testing','Flight Simulation','Stability & Control','Spacecraft Control','Terrain Following & Navigation','Flight Supporting Structures','Non-linear modeling','Navigation','Modern controllers','Flight Design & Optimization','Air traffic','Sys identification');

dArray[5]=new Array('','Utilization','Transportation Systems','Navigation and Sensors','Orbital Dynamics, Perturbations and Stability','Attitude Dynamics, Determination and Control','Environmental Testing','Debris and Protection Systems','Innovative Design Techniques');

dArray[6]=new Array('','Strategic Management','Technology Management','Aerospace Project Management','Aerospace Regulations & Laws','Privatization','Flight Safety','Air transportation','Technology transfer','Aerospace Systems Performance Assessment','Forecasting','Operational Research');

dArray[7]=new Array('','Flight Propulsion Design','Ornitopters (Flapping Wing Air Vehicles)','Human-Powered Airplanes','Unmanned Air Vehicle','Aerospace System Design','Space System Design','Micro Air Vehicles','Micro & nano Systems','Design Philosophies');



for (var k=0 ; k < dArray
[listIndex].length;k++)

{

var elOptNew = document.createElement('option');

elOptNew.text = '' + dArray
[listIndex][k];
elOptNew.value = '' + dArray
[listIndex][k];

//elOptNew.value = k;

var elSel = document.getElementById(nameID);



try {

elSel.add(elOptNew, null);

}

catch(ex) {

elSel.add(elOptNew);

}

}

}



function setHiddenValue(hidInputNameID, selectedListIndex,formNameID,selectObject)

{

document.forms[formNameID][hidInputNameID].value = selectObject.options[selectedListIndex].text

}